document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=549930>Question 549930</A>: <I><SPAN STYLE=\"word-break: break-all;\"> when Marvin was 2 km. upstream from where he started his canoe trip, he passed a log floating with the current. After paddling upstream for one more hour, he paddled back and reached his starting point just as the log arrived.\r<BR>\n" );
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document.write( "How fast was the current flowing? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #358199 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=358199\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> when Marvin was 2 km. upstream from where he started his canoe trip, he passed a log floating with the current. After paddling upstream for one more hour, he paddled back and reached his starting point just as the log arrived. <BR>\n" );
document.write( "How fast was the current flowing?<BR>\n" );
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document.write( "Draw the picture:<BR>\n" );
document.write( "Upstream DATA:<BR>\n" );
document.write( "time = 1Downstream DATA:<BR>\n" );
document.write( "distance = p-c+2 km ; rate = p+c km/h ; time = (p-c+2)/(p+c) hrs<BR>\n" );
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document.write( "Log DATA:<BR>\n" );
document.write( "rate = c km/h ; distance 2 km ; time = d/r = 2/c hrs<BR>\n" );
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document.write( "Equation:<BR>\n" );
document.write( "time up + time down = 2/c hrs<BR>\n" );
document.write( "1 hr + (p-c+2)/(p+c) hr = 2/c hr<BR>\n" );
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document.write( "Multiplthru by c(p+c) to get:<BR>\n" );
document.write( "c(p+c) + c(p-c+2) = 2(p+c)<BR>\n" );
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document.write( "cp + c^2 + cp-c^2+2c = 2p+2c<BR>\n" );
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document.write( "2cp = 2p<BR>\n" );
document.write( "cp = p<BR>\n" );
document.write( "current speed is 1 km/hr<BR>\n" );
document.write( "=============================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=================<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );