document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=385317>Question 385317</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boat travels 2 km/hr in still water.  the boat travels 4 km in the same amount of time it takes to travel 1 km upstream.  what is the speed of 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 #272615 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=272615\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a boat travels 2 km/hr in still water.  the boat travels 4 km in the same amount of time it takes to travel 1 km upstream.  what is the speed of the river?<BR>\n" );
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document.write( "speed of boat in still water = 2km/h<BR>\n" );
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document.write( "let speed of current = c km/h<BR>\n" );
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document.write( "upstream seed 2-c<BR>\n" );
document.write( "downstream speed = 2+c<BR>\n" );
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document.write( "upstream d=1<BR>\n" );
document.write( "downstream d=4<BR>\n" );
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document.write( "t=d/r<BR>\n" );
document.write( "t upstream = t downstream<BR>\n" );
document.write( "1/(2-c)=4/(2+c)<BR>\n" );
document.write( "cross multiply<BR>\n" );
document.write( "(2+c)=4(2-c)<BR>\n" );
document.write( "2+c=8-4c<BR>\n" );
document.write( "5c=6<BR>\n" );
document.write( "c=6/5 km/h<BR>\n" );
document.write( "...<BR>\n" );
document.write( "m.ananth@hotmail.ca </SPAN>\n" );
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