document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=575063>Question 575063</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I rowed 20 km up a river that had a steady current in 5 hours and returned downstream in 2.5 hours.  How fast would I have rowed the boat in still water, and what is the speed of the current?\r<BR>\n" );
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document.write( "Let x be the speed of the boat in still water and y the speed of the current (km/h). The speed of the boat going upstream is (x –y) km/h and the speed of the boat going downstream is (x+y) km/h,.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #369365 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=369365\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I rowed 20 km up a river that had a steady current in 5 hours and returned downstream in 2.5 hours. How fast would I have rowed the boat in still water, and what is the speed of the current? <BR>\n" );
document.write( "Let x be the speed of the boat in still water and y the speed of the current (km/h). The speed of the boat going upstream is (x –y) km/h and the speed of the boat going downstream is (x+y) km/h,.<BR>\n" );
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document.write( "Upstream DATA:<BR>\n" );
document.write( "distance = 20 km ; rate = (x-y)km/h ; time = 20/(x-y) hr<BR>\n" );
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document.write( "Downstream DATA:<BR>\n" );
document.write( "distance = 20 km ; rate = (x+y)km/h ; time = 20/(x+y) hr<BR>\n" );
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document.write( "Equation:<BR>\n" );
document.write( "20/(x-y) = 5 hrs<BR>\n" );
document.write( "20/(x+y) = 2.5 hrs<BR>\n" );
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document.write( "x-y = 4<BR>\n" );
document.write( "x+y = 8<BR>\n" );
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document.write( "Add and solve for \"x\":<BR>\n" );
document.write( "2x = 12<BR>\n" );
document.write( "x = 6 km/h (boat speed in calm water)<BR>\n" );
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document.write( "Solve for \"y\":<BR>\n" );
document.write( "x+y = 8<BR>\n" );
document.write( "y = 2 km/h (current speed)<BR>\n" );
document.write( "================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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