document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=893647>Question 893647</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boat can maintain a speed of 6 mph over still water. piloting the boat from a dock to a campsite some distance up river took 6 hours. after camping for the weekend, the return trip from the campsite to the dock took 4 hours. rounding to the nearest tenth, how fast is the river? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #541481 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=541481\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a boat can maintain a speed of 6 mph over still water. piloting the boat from a dock to a campsite some distance up river took 6 hours. after camping for the weekend, the return trip from the campsite to the dock took 4 hours. rounding to the nearest tenth, how fast is the river?<BR>\n" );
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document.write( "let c=speed of river current<BR>\n" );
document.write( "6+c=speed of boat downstream<BR>\n" );
document.write( "6-c=speed of boat upstream<BR>\n" );
document.write( "distance=travel time*speed<BR>\n" );
document.write( "..<BR>\n" );
document.write( "6(6-c)=4(6+c)<BR>\n" );
document.write( "36-6c=24+4c<BR>\n" );
document.write( "10c=12<BR>\n" );
document.write( "c=1.2<BR>\n" );
document.write( "how fast is the river current?  1.2 mph </SPAN>\n" );
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