document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=581152>Question 581152</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A paddle boat can move at a speed of 20 km/h in still water. The boat is paddled 14 km downstream in a river in the same time it takes to go 7 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 #371473 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=371473\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Boat speed	=	20	km/h										<BR>\n" );
document.write( "current  speed	=	x	km/h										<BR>\n" );
document.write( "													<BR>\n" );
document.write( "speed against	current	20	-	x									<BR>\n" );
document.write( "speed with	current	20	+	x									<BR>\n" );
document.write( "													<BR>\n" );
document.write( "Distance against	current	7	km										<BR>\n" );
document.write( "Distance with	current	14	km										<BR>\n" );
document.write( "													<BR>\n" );
document.write( "t=d/r	time against = time with		current										<BR>\n" );
document.write( "7/(20-x	)=14/(20+x)<BR>\n" );
document.write( "7(20+x)=14(20-x)			<BR>\n" );
document.write( "140+7x	=280-14	x					<BR>\n" );
document.write( "14x+7x=280-140						<BR>\n" );
document.write( "21x=140										<BR>\n" );
document.write( "/21									<BR>\n" );
document.write( "x	=	6.67	km/h	current  speed									 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );