document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=144580>Question 144580</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The Hudson River flows at a rate of 3 miles per hour.  A patrol boat travels 60 miles upriver, and returns in a total time of 9 hours.  What is the speed of the boat 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 #105353 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=105353\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s ALIGN=MIDDLE  ALT=\"s\"   DISABLED_style= \"max-width:90%; height:auto;\" >= speed of the boat in still water<BR>\n" );
document.write( "The current = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3 ALIGN=MIDDLE  ALT=\"3\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/hr<BR>\n" );
document.write( "In words:<BR>\n" );
document.write( "(distance traveled upriver)/(rate going upriver)<BR>\n" );
document.write( "+ (distance traveled downriver)/(rate going downriver) = 9 hrs<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60+%2F+%28s+-+3%29+%2B+60+%2F+%28s+%2B+3%29+=+9 ALIGN=MIDDLE  ALT=\"60+%2F+%28s+-+3%29+%2B+60+%2F+%28s+%2B+3%29+=+9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "multiply both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28s+-+3%29%28s+%2B+3%29 ALIGN=MIDDLE  ALT=\"%28s+-+3%29%28s+%2B+3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60%2A%28s+%2B+3%29+%2B+60%2A%28s+-+3%29+=+9%28s%5E2+-+9%29 ALIGN=MIDDLE  ALT=\"60%2A%28s+%2B+3%29+%2B+60%2A%28s+-+3%29+=+9%28s%5E2+-+9%29\"   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=3 ALIGN=MIDDLE  ALT=\"3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20%2A%28s+%2B+3+%2B+s+-+3%29+=+3s%5E2+-+27 ALIGN=MIDDLE  ALT=\"20%2A%28s+%2B+3+%2B+s+-+3%29+=+3s%5E2+-+27\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=40s+=+3s%5E2+-+27 ALIGN=MIDDLE  ALT=\"40s+=+3s%5E2+-+27\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3s%5E2+-+40s+-+27+=+0 ALIGN=MIDDLE  ALT=\"3s%5E2+-+40s+-+27+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "solve using quadratic fornula<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"s+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+%28-%28-40%29+%2B-+sqrt%28+%28-40%29%5E2-4%2A3%2A%28-27%29+%29%29%2F%282%2A3%29+ ALIGN=MIDDLE  ALT=\"s+=+%28-%28-40%29+%2B-+sqrt%28+%28-40%29%5E2-4%2A3%2A%28-27%29+%29%29%2F%282%2A3%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+%2840+%2B-+sqrt%281600+%2B+324+%29%29+%2F+6+ ALIGN=MIDDLE  ALT=\"s+=+%2840+%2B-+sqrt%281600+%2B+324+%29%29+%2F+6+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+%2840+%2B-+sqrt%281924+%29%29+%2F+6+ ALIGN=MIDDLE  ALT=\"s+=+%2840+%2B-+sqrt%281924+%29%29+%2F+6+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+%2840+%2B+43.863%29%2F6 ALIGN=MIDDLE  ALT=\"s+=+%2840+%2B+43.863%29%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+83.86%2F6 ALIGN=MIDDLE  ALT=\"s+=+83.86%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+13.98 ALIGN=MIDDLE  ALT=\"s+=+13.98\"   DISABLED_style= \"max-width:90%; height:auto;\" >mi/hr<BR>\n" );
document.write( "If you plug this back into the original equation, it checks out </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );