document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=921393>Question 921393</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi would you please help me solve my homework problem. \r<BR>\n" );
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document.write( "A paddle boat can move at a speed of 20km/h in still water. The boat is paddled 18km downstream in a river in the same time it takes to go 9km upstream. What is the speed of the river?\r<BR>\n" );
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document.write( "According to my teacher the anser is 20/3 km/h. Would you please show me the steps on how to solve this problem. Thank you.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #558961 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=558961\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A paddle boat can move at a speed of 20km/h in still water. The boat is paddled 18km downstream in a river in the same time it takes to go 9km upstream. What is the speed of the river? <BR>\n" );
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document.write( "let c=speed of the river current<BR>\n" );
document.write( "20+c=speed of paddle boat downstream<BR>\n" );
document.write( "20-c=speed of paddle boat upstream<BR>\n" );
document.write( "travel time=distance/speed<BR>\n" );
document.write( "..<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=18%2F%2820%2Bc%29=9%2F%2820-c%29 ALIGN=MIDDLE  ALT=\"18%2F%2820%2Bc%29=9%2F%2820-c%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "18(20-c)=9(20+c)<BR>\n" );
document.write( "360-18c=180+9c<BR>\n" );
document.write( "27c=180<BR>\n" );
document.write( "c=6 2/3=20/3<BR>\n" );
document.write( "speed of the river current=20/3 km/hr </SPAN>\n" );
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