document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=807709>Question 807709</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels 100 miles downstream in the same length of time it travels 50 miles upstream. If the boat's speed and still water at 30 mph, find the speed of the current 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 #486536 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=486536\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Boat speed	=	30	mph										<BR>\n" );
document.write( "current speed	=	x	mph										<BR>\n" );
document.write( "													<BR>\n" );
document.write( "speed against	current	30	-	x									<BR>\n" );
document.write( "speed with	current	30	+	x									<BR>\n" );
document.write( "													<BR>\n" );
document.write( "Distance against	current	50	miles										<BR>\n" );
document.write( "Distance with	current	100	miles										<BR>\n" );
document.write( "													<BR>\n" );
document.write( "t=d/r	time against = time with		current	-									<BR>\n" );
document.write( "50	/	(	30	-	x	)=	100	/	(	30	+	x	)<BR>\n" );
document.write( "50	(	30	+	x 	)=	100	(	30	-x	)			<BR>\n" );
document.write( "1500	+	50	x	=	3000	-	-100	x					<BR>\n" );
document.write( "100	x	50	x		3000	+	-1500						<BR>\n" );
document.write( "150	x	=	1500										<BR>\n" );
document.write( "/	150												<BR>\n" );
document.write( "x	=	10	mph	current	speed								<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );