document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=347782>Question 347782</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An airplane takes 3 hours to travel a distance of 2160 miles with the wind. The return trip takes 4 hours against the wind. Find the speed of the plane in still air and the speed of the wind. <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #248651 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=248651\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> time = distance /speed<BR>\n" );
document.write( "speed upwind = x-y<BR>\n" );
document.write( "speed downwind = x+y<BR>\n" );
document.write( "time = 2160/x+y=3<BR>\n" );
document.write( "x+y = 2160/3<BR>\n" );
document.write( "x+y=720........................1<BR>\n" );
document.write( "upwind <BR>\n" );
document.write( "time = 2160/x-y = 4<BR>\n" );
document.write( "2160/4 = x-y<BR>\n" );
document.write( "340 = x-y......................2<BR>\n" );
document.write( "add equation 1 & 2<BR>\n" );
document.write( "2x= 1060<BR>\n" );
document.write( "x= 530 mph<BR>\n" );
document.write( ".....<BR>\n" );
document.write( "x+y=720<BR>\n" );
document.write( "530+y=720<BR>\n" );
document.write( "y=720-530<BR>\n" );
document.write( "y= 90 mph<BR>\n" );
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