document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=730127>Question 730127</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A woman rows a boat upstream form one point on a river to another point 12km away in 1 and half hours. The return trip with the current takes only 40 minutes. How fast would she be rowing if she were rowing in still water (as if there is no current), and what speed is the current flowing ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #446491 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=446491\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Boat speed	speed	=x	mph					<BR>\n" );
document.write( "current     	speed	=y	mph					<BR>\n" );
document.write( "against 	current     	1.5	hours					<BR>\n" );
document.write( "with 	current     	  2/ 3	hours					<BR>\n" );
document.write( "								<BR>\n" );
document.write( "Distance with	current     	12	miles		distance against	current     	12	<BR>\n" );
document.write( "t=d/r	against	current     	(x-y)					<BR>\n" );
document.write( "12.00	/	(	x	-	y	)=	1.50	<BR>\n" );
document.write( "								<BR>\n" );
document.write( "1.50	x	-	-1.50	y	=	12.00	....................1	<BR>\n" );
document.write( "with	current     	(x+y)						<BR>\n" );
document.write( "12.00	/	(	x	+	y	)=	 2/3	<BR>\n" );
document.write( " 2/3	(	x	+	y	)	=	12.00	<BR>\n" );
document.write( " 2/3	x	+	 2/3	y	=	12.00	<BR>\n" );
document.write( "2x+2y=36<BR>\n" );
document.write( "x+y=18........................(2)\r<BR>\n" );
document.write( "\n" );
document.write( "multiply equation (1) by 2<BR>\n" );
document.write( "we get3x-3y=24<BR>\n" );
document.write( "multiply equation (2) by 3<BR>\n" );
document.write( "3x+3y=54\r<BR>\n" );
document.write( "\n" );
document.write( "add up the equations<BR>\n" );
document.write( "6x=78<BR>\n" );
document.write( "x=13 km/h the speed of boat in stll water<BR>\n" );
document.write( "plug x in the equation x+y=18<BR>\n" );
document.write( "y=5km/h the current speed </SPAN>\n" );
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