document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=34163>Question 34163</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I can't figure out how to set this problem up. Your help would be greatly appreciated. <BR>\n" );
document.write( "An airplane travels 400 miles against the wind in 4 hours, and makes the return trip with the same wind in 2 hours. Find the speed of the wind.\r<BR>\n" );
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document.write( "Thank you. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #20456 by </B><A HREF=/tutors/aboutme.mpl?userid=Paul><B>Paul(988)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Paul><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=20456\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the speed of the plane be x<BR>\n" );
document.write( "Let the speed of the wind be y<BR>\n" );
document.write( "2x+2y=400<BR>\n" );
document.write( "y=200-x (subsitution)<BR>\n" );
document.write( "4x-4y=400<BR>\n" );
document.write( "4x-4(200-x)=400<BR>\n" );
document.write( "8x=1200<BR>\n" );
document.write( "x=150<BR>\n" );
document.write( "y=200-150<BR>\n" );
document.write( "y=50<BR>\n" );
document.write( "Hence, the speed of the plane is 150mph and the speed of the wind is 50mph.<BR>\n" );
document.write( "PAul. </SPAN>\n" );
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