document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=432281>Question 432281</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An airplane can fly 660 miles with the wind in the same amount of time it takes to fly 540 miles against the same wind. If the air speed of the plane in still air is 150 miles per hour, what is the speed of the wind? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #299790 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=299790\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> plane speed	=	150	kmph										<BR>\n" );
document.write( "wind speed	=	x	kmph						<BR>\n" );
document.write( "speed against wind=	150-x							<BR>\n" );
document.write( "speed with wind	150+x						<BR>\n" );
document.write( "Distance against wind		540	km										<BR>\n" );
document.write( "Distance with tail wind		660	km				<BR>\n" );
document.write( "t=d/r	time upstream = time downstream												<BR>\n" );
document.write( "540/(150-x)=660/(150+x)<BR>\n" );
document.write( "540(150+x)=660(150-x)			<BR>\n" );
document.write( "81000+540x=99000-660	x 					<BR>\n" );
document.write( "660x+540x=18000								<BR>\n" );
document.write( "1200x=18000										<BR>\n" );
document.write( "/1200												<BR>\n" );
document.write( "x=15mph	wind speed		 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );