document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=433951>Question 433951</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels 45 miles downstream in the same time it takes to travel 30 miles upstream. If the speed of the boat in still water is 12 mph what's the rate of the current? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #300776 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=300776\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Boat speed	=	12	mph										<BR>\n" );
document.write( "current speed 	=	x	mph										<BR>\n" );
document.write( "wind speed													<BR>\n" );
document.write( "speed against  	current	12-x						<BR>\n" );
document.write( "speed with 	current	12+x					<BR>\n" );
document.write( "Distance against current 30 mph										<BR>\n" );
document.write( "Distance with 	current	45	mph					<BR>\n" );
document.write( "t=d/r	time upstream = time downstream												<BR>\n" );
document.write( "30/(12-x)=45/(12+x)<BR>\n" );
document.write( "30(12+x)=45(12-x)			<BR>\n" );
document.write( "360+30x	=540-45	x 					<BR>\n" );
document.write( "45x+30x	=180								<BR>\n" );
document.write( "75x=180										<BR>\n" );
document.write( "/75												<BR>\n" );
document.write( "x=2.4	mph	current speed 					<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );