document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=447480>Question 447480</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the rate of a plane in calm air is 140 mph. flying with the wind, the plane can fly 450 miles in 2 hours less time than is required to make the return trip against the wind. find the rate 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 #311129 by </B><A HREF=/tutors/aboutme.mpl?userid=jorel1380><B>jorel1380(3719)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jorel1380><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=jorel1380><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=311129\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 450/(140+x)+2=450/(140-x)<BR>\n" );
document.write( "450(140-x)+2(140+x)(140-x)=450(140+x)<BR>\n" );
document.write( "63000-450x+39200-2x2=63000+450x<BR>\n" );
document.write( "39200-900x-2x2=0<BR>\n" );
document.write( "0=2x2+900x-39200<BR>\n" );
document.write( "0=x2+450x-19600<BR>\n" );
document.write( "(x+490)(x-40)=0<BR>\n" );
document.write( "x=-490 or 40<BR>\n" );
document.write( "Throwing out the negative answer, we get the wind speed to be 40 mph..<BR>\n" );
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