document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1082577>Question 1082577</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In Still water, a boat averages 18 miles per hour. It takes the same amount of time to travel 10 miles downstream, with the current. As it does 5 miles Upstream, against the current. What is the rate of the water's current? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #696634 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=696634\">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=+c+ ALIGN=MIDDLE  ALT=\"+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the rate of the current in mi/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+18+%2B+c+ ALIGN=MIDDLE  ALT=\"+18+%2B+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the rate of the boat going downstream in mi/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+18+-+c+ ALIGN=MIDDLE  ALT=\"+18+-+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the rate of the boat going upstream in mi/hr<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = time in hrs for both upstream and downstream trips<BR>\n" );
document.write( "----------------------------------------------------------<BR>\n" );
document.write( "Going downstream:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+10+=+%28+18+%2B+c+%29%2At+ ALIGN=MIDDLE  ALT=\"+10+=+%28+18+%2B+c+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Going upstream:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+5+=+%28+18+-+c+%29%2At+ ALIGN=MIDDLE  ALT=\"+5+=+%28+18+-+c+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+10+%2F+%28+18+%2B+c+%29+ ALIGN=MIDDLE  ALT=\"+t+=+10+%2F+%28+18+%2B+c+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Plug (1) into (2)<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+5+=+%28+18+-+c+%29%2A%28+10+%2F+%28+18+%2B+c+%29+%29+ ALIGN=MIDDLE  ALT=\"+5+=+%28+18+-+c+%29%2A%28+10+%2F+%28+18+%2B+c+%29+%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%2A%28+18+%2B+c+%29+=+10%2A%28+18+-+c+%29+ ALIGN=MIDDLE  ALT=\"+5%2A%28+18+%2B+c+%29+=+10%2A%28+18+-+c+%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=+90+%2B+5c+=+180+-+10c+ ALIGN=MIDDLE  ALT=\"+90+%2B+5c+=+180+-+10c+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+15c+=+90+ ALIGN=MIDDLE  ALT=\"+15c+=+90+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+6+ ALIGN=MIDDLE  ALT=\"+c+=+6+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The rate of thr current is 6 mi/hr<BR>\n" );
document.write( "--------------------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+10+%2F+%28+18+%2B+c+%29+ ALIGN=MIDDLE  ALT=\"+t+=+10+%2F+%28+18+%2B+c+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+10+%2F+%28+18+%2B+6+%29+ ALIGN=MIDDLE  ALT=\"+t+=+10+%2F+%28+18+%2B+6+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+10%2F24+ ALIGN=MIDDLE  ALT=\"+t+=+10%2F24+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+5%2F12+ ALIGN=MIDDLE  ALT=\"+t+=+5%2F12+\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+5+%2F+%28+18+-+c+%29+ ALIGN=MIDDLE  ALT=\"+t+=+5+%2F+%28+18+-+c+%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=+t+=+5+%2F+%28+18+-+6+%29+ ALIGN=MIDDLE  ALT=\"+t+=+5+%2F+%28+18+-+6+%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=+t+=+5%2F12+ ALIGN=MIDDLE  ALT=\"+t+=+5%2F12+\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs<BR>\n" );
document.write( "---------------------------<BR>\n" );
document.write( "Note:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+5%2F12%2A60+=+25+ ALIGN=MIDDLE  ALT=\"+5%2F12%2A60+=+25+\"   DISABLED_style= \"max-width:90%; height:auto;\" > min<BR>\n" );
document.write( "OK<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );