document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=736297>Question 736297</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Lily's family took a motor boat 24 km down a river for a picnic. It took them 1 hr to get to the picnic spot. The ride back to the dock took an hour and a half. What was the average speed at which the river flowed? What would the boat's average speed be on a lake? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #449772 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=449772\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Boat 	speed	=x	kph					<BR>\n" );
document.write( "current     	speed	=y	kph					<BR>\n" );
document.write( "against  	current     	1.5	hours					<BR>\n" );
document.write( "with	current     	1	hours					<BR>\n" );
document.write( "								<BR>\n" );
document.write( "Distance against 		24	miles	distance with 		24	miles	<BR>\n" );
document.write( "t=d/r	against	current     		-				<BR>\n" );
document.write( "24.00	/	(	x	-	y	)=	1.50	<BR>\n" );
document.write( "1.50	(	x	-	y	)	=	24.00	<BR>\n" );
document.write( "1.50	x	-	1.50	y	=	24.00	....................1	<BR>\n" );
document.write( "								<BR>\n" );
document.write( "24.00	/	(	x	+	y	)=	1.00	<BR>\n" );
document.write( "1.00	(	x	+	y	)	=	24.00	<BR>\n" );
document.write( "1.00	x	+	1.00	y	=	24.00	...............2	<BR>\n" );
document.write( "Multiply (1) by	1.00							<BR>\n" );
document.write( "Multiply (2) by	1.50							<BR>\n" );
document.write( "we get								<BR>\n" );
document.write( "1.50	x	+	-1.50	y	=	24.00		<BR>\n" );
document.write( "1.50	x	+	1.50	y	=	36.00		<BR>\n" );
document.write( "3.00	x	=	60.00					<BR>\n" );
document.write( "/	3.00							<BR>\n" );
document.write( "x	=	20.00	mph					<BR>\n" );
document.write( "								<BR>\n" );
document.write( "plug value of x in (1)				y				<BR>\n" );
document.write( "1.50	x		-1.50	y	=	24.00		<BR>\n" );
document.write( "30.00			-1.50	-30.00	=	24.00		<BR>\n" );
document.write( "-1.50	y	=	24.00					<BR>\n" );
document.write( "-1.50	y	=	-6.00	kph				<BR>\n" );
document.write( "	y	=	4.00					<BR>\n" );
document.write( "Boat 	speed	20.00	mph					<BR>\n" );
document.write( "current     	speed	4.00	kph					<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );