document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=388885>Question 388885</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat can travel at a speed of 15 kph in still water. The boat travels 40 km downstream on a river at the same time it takes to travel 25 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 #275293 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=275293\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A boat can travel at a speed of 15 kph in still water. The boat travels 40 km downstream on a river at the same time it takes to travel 25 km upstream. What is the speed of the river?<BR>\n" );
document.write( "speed of boat = 15 kph<BR>\n" );
document.write( "speed of river = x kph<BR>\n" );
document.write( "...<BR>\n" );
document.write( "d downstream = 40 km<BR>\n" );
document.write( "d upstream = 25 km<BR>\n" );
document.write( "..<BR>\n" );
document.write( "time upstream = time downstream<BR>\n" );
document.write( "40/15+x = 25/15-x<BR>\n" );
document.write( "cross multiply<BR>\n" );
document.write( "40(15-x)=25(15+x)<BR>\n" );
document.write( "600-40x=375+25x<BR>\n" );
document.write( "600-375=40x+25x<BR>\n" );
document.write( "225=65x<BR>\n" );
document.write( "/65<BR>\n" );
document.write( "3.46 km/h speed of current<BR>\n" );
document.write( "..<BR>\n" );
document.write( "m.ananth@hotmail.ca </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );