document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=178714>Question 178714</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help.<BR>\n" );
document.write( "Debbie traveled by boat 5 miles upstream to fish in her favorite spot. Because of the 4-mph current, it took her 20 minutes longer to get there than to return. How fast will her boat go in still water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #133680 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=133680\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the speed of her boat in still water = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s ALIGN=MIDDLE  ALT=\"s\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Let the speed of the current = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c ALIGN=MIDDLE  ALT=\"c\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Against the current:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5B1%5D+=+r%5B1%5D%2At%5B1%5D ALIGN=MIDDLE  ALT=\"d%5B1%5D+=+r%5B1%5D%2At%5B1%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B1%5D+=+s+-+c ALIGN=MIDDLE  ALT=\"r%5B1%5D+=+s+-+c\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5B1%5D+=+%28s+-+c%29%2At%5B1%5D ALIGN=MIDDLE  ALT=\"d%5B1%5D+=+%28s+-+c%29%2At%5B1%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "with the current:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5B2%5D+=+r%5B2%5D%2At%5B2%5D ALIGN=MIDDLE  ALT=\"d%5B2%5D+=+r%5B2%5D%2At%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B2%5D+=+s+-+c ALIGN=MIDDLE  ALT=\"r%5B2%5D+=+s+-+c\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5B2%5D+=+%28s+%2B+c%29%2At%5B2%5D ALIGN=MIDDLE  ALT=\"d%5B2%5D+=+%28s+%2B+c%29%2At%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "given:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5B1%5D+=+5 ALIGN=MIDDLE  ALT=\"d%5B1%5D+=+5\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5B2%5D+=+5 ALIGN=MIDDLE  ALT=\"d%5B2%5D+=+5\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c+=+4 ALIGN=MIDDLE  ALT=\"c+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B1%5D+=+t%5B2%5D+%2B+20%2F60 ALIGN=MIDDLE  ALT=\"t%5B1%5D+=+t%5B2%5D+%2B+20%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > hr (20 min is 20/60 of an hour)<BR>\n" );
document.write( "--------------------------<BR>\n" );
document.write( "Now I can write:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%28s+-+4%29%2A%28t%5B2%5D+%2B+1%2F3%29 ALIGN=MIDDLE  ALT=\"5+=+%28s+-+4%29%2A%28t%5B2%5D+%2B+1%2F3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%28s+%2B+4%29%2At%5B2%5D ALIGN=MIDDLE  ALT=\"5+=+%28s+%2B+4%29%2At%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "I have 2 equations and 2 unknowns, so it should be solvable<BR>\n" );
document.write( "Since both (1) and (2) = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5 ALIGN=MIDDLE  ALT=\"5\"   DISABLED_style= \"max-width:90%; height:auto;\" >, I'll set the right sides<BR>\n" );
document.write( "equal to eachother<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28s+-+4%29%2A%28t%5B2%5D+%2B+1%2F3%29+=+%28s+%2B+4%29%2At%5B2%5D ALIGN=MIDDLE  ALT=\"%28s+-+4%29%2A%28t%5B2%5D+%2B+1%2F3%29+=+%28s+%2B+4%29%2At%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Divide both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B2%5D ALIGN=MIDDLE  ALT=\"t%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28s+-+4%29%2A%281+%2B+%281%2F3%29%2Ft%5B2%5D%29+=+s+%2B+4 ALIGN=MIDDLE  ALT=\"%28s+-+4%29%2A%281+%2B+%281%2F3%29%2Ft%5B2%5D%29+=+s+%2B+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+-+4+%2B+%28s%2F3%29%2Ft%5B2%5D+-+%284%2F3%29%2Ft%5B2%5D+=+s+%2B+4 ALIGN=MIDDLE  ALT=\"s+-+4+%2B+%28s%2F3%29%2Ft%5B2%5D+-+%284%2F3%29%2Ft%5B2%5D+=+s+%2B+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28s%2F3+-+4%2F3%29%2Ft%5B2%5D+=+8 ALIGN=MIDDLE  ALT=\"%28s%2F3+-+4%2F3%29%2Ft%5B2%5D+=+8\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s%2F3+-+4%2F3+=+8t%5B2%5D ALIGN=MIDDLE  ALT=\"s%2F3+-+4%2F3+=+8t%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+-+4+=+24t%5B2%5D ALIGN=MIDDLE  ALT=\"s+-+4+=+24t%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B2%5D+=+%28s+-+4%29%2F24 ALIGN=MIDDLE  ALT=\"t%5B2%5D+=+%28s+-+4%29%2F24\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Substitute this value of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B2%5D ALIGN=MIDDLE  ALT=\"t%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > into (2)<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%28s+%2B+4%29%2At%5B2%5D ALIGN=MIDDLE  ALT=\"5+=+%28s+%2B+4%29%2At%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%28s+%2B+4%29%28s+-+4%29%2F24 ALIGN=MIDDLE  ALT=\"5+=+%28s+%2B+4%29%28s+-+4%29%2F24\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s%5E2+-+16+=+120 ALIGN=MIDDLE  ALT=\"s%5E2+-+16+=+120\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s%5E2+=+136 ALIGN=MIDDLE  ALT=\"s%5E2+=+136\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+11.66 ALIGN=MIDDLE  ALT=\"s+=+11.66\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Her boat will go 11.66 mi/hr in still water<BR>\n" );
document.write( "check answer:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%28s+%2B+4%29%2At%5B2%5D ALIGN=MIDDLE  ALT=\"5+=+%28s+%2B+4%29%2At%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%2811.66+%2B+4%29%2At%5B2%5D ALIGN=MIDDLE  ALT=\"5+=+%2811.66+%2B+4%29%2At%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+15.66t%5B2%5D ALIGN=MIDDLE  ALT=\"5+=+15.66t%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B2%5D+=+5%2F15.66 ALIGN=MIDDLE  ALT=\"t%5B2%5D+=+5%2F15.66\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B2%5D+=+.319 ALIGN=MIDDLE  ALT=\"t%5B2%5D+=+.319\"   DISABLED_style= \"max-width:90%; height:auto;\" >hrs<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B1%5D+=+t%5B2%5D+%2B+20%2F60 ALIGN=MIDDLE  ALT=\"t%5B1%5D+=+t%5B2%5D+%2B+20%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B1%5D+=+.319+%2B+.333 ALIGN=MIDDLE  ALT=\"t%5B1%5D+=+.319+%2B+.333\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B1%5D+=+.653 ALIGN=MIDDLE  ALT=\"t%5B1%5D+=+.653\"   DISABLED_style= \"max-width:90%; height:auto;\" >hrs<BR>\n" );
document.write( "------------------------<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%28s+-+4%29%2A%28t%5B2%5D+%2B+1%2F3%29 ALIGN=MIDDLE  ALT=\"5+=+%28s+-+4%29%2A%28t%5B2%5D+%2B+1%2F3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%2811.66+-+4%29%2A.653 ALIGN=MIDDLE  ALT=\"5+=+%2811.66+-+4%29%2A.653\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+7.66%2A.653 ALIGN=MIDDLE  ALT=\"5+=+7.66%2A.653\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+4.998 ALIGN=MIDDLE  ALT=\"5+=+4.998\"   DISABLED_style= \"max-width:90%; height:auto;\" > close enough<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+%28s+%2B+4%29%2At%5B2%5D ALIGN=MIDDLE  ALT=\"5+=+%28s+%2B+4%29%2At%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+15.66%2A.319 ALIGN=MIDDLE  ALT=\"5+=+15.66%2A.319\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+4.995 ALIGN=MIDDLE  ALT=\"5+=+4.995\"   DISABLED_style= \"max-width:90%; height:auto;\" > close enough<BR>\n" );
document.write( "And, also <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B1%5D ALIGN=MIDDLE  ALT=\"t%5B1%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > should be 20 min<BR>\n" );
document.write( "longer than <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B2%5D ALIGN=MIDDLE  ALT=\"t%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5B1%5D+-+t%5B2%5D+=+.653+-+.319 ALIGN=MIDDLE  ALT=\"t%5B1%5D+-+t%5B2%5D+=+.653+-+.319\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.653+-+.319+=+.334 ALIGN=MIDDLE  ALT=\".653+-+.319+=+.334\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.334%2A60+=+20.04 ALIGN=MIDDLE  ALT=\".334%2A60+=+20.04\"   DISABLED_style= \"max-width:90%; height:auto;\" >min close enough\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );