document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=807432>Question 807432</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Manuel has a boat that can move at a speed of 15 km/h in still water. He rides 140 km downstream in a river in the same time it takes to ride 35 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 #486298 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=486298\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Boat speed	=	15	km/h										<BR>\n" );
document.write( "current speed	=	x	km/h										<BR>\n" );
document.write( "													<BR>\n" );
document.write( "speed against	current	15	-	x									<BR>\n" );
document.write( "speed with	current	15	+	x									<BR>\n" );
document.write( "													<BR>\n" );
document.write( "Distance against	current	35	miles										<BR>\n" );
document.write( "Distance with	current	140	miles										<BR>\n" );
document.write( "													<BR>\n" );
document.write( "t=d/r	time against = time with		current	-									<BR>\n" );
document.write( "35	/	(	15	-	x	)=	140	/	(	15	+	x	)<BR>\n" );
document.write( "35	(	15	+	x 	)=	140	(	15	-x	)			<BR>\n" );
document.write( "525	+	35	x	=	2100	-	-140	x					<BR>\n" );
document.write( "140	x	35	x		2100	+	-525						<BR>\n" );
document.write( "175	x	=	1575										<BR>\n" );
document.write( "/	175												<BR>\n" );
document.write( "x	=	9	km/h	current	speed								<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );