document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=739969>Question 739969</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane travels at a speed of 205 mph in still air. Flying with a tailwind, the plane is clocked over a distance of 800 miles. Flying against a headwind, it takes 1 hour more time to complete the return trip. What was the wind velocity? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #451436 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=451436\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> plane speed = 205 mph<BR>\n" );
document.write( "wind sped = x mph\r<BR>\n" );
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document.write( "against wind = 205-x<BR>\n" );
document.write( "with wind = 205 +x\r<BR>\n" );
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document.write( "t=d/r\r<BR>\n" );
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document.write( "time against wind - time with wind =1\r<BR>\n" );
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document.write( "800/(205-x)-800/(205+x) =1\r<BR>\n" );
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document.write( "800(205+x)-800(205-x)=(205-x)(205+x)\r<BR>\n" );
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document.write( "164000+800x-164000+800x=42025-x^2\r<BR>\n" );
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document.write( "1600x+x^2-42025=0\r<BR>\n" );
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document.write( "solve for x the wind speed should get wind speed = 25.85 mph </SPAN>\n" );
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