document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1039246>Question 1039246</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane travels at a speed of 160 mph in still air. Flying with a tailwind the plane is clocked over a distance of 800 miles. Flying against a headwind, it takes 3 hours longer 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 #653991 by </B><A HREF=/tutors/aboutme.mpl?userid=jorel555><B>jorel555(1290)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jorel555><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=653991\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let w be the wind speed. Then:<BR>\n" );
document.write( "800/160+r +3=800/160-r<BR>\n" );
document.write( "800(160-r)+3(25600-r^2)=800(160+r)<BR>\n" );
document.write( "128000-800r+76800-3r^2=128000+800r<BR>\n" );
document.write( "3r^2+1600r-76800=0<BR>\n" );
document.write( "Using the quadratic formula, we get r=44.317,-577.65<BR>\n" );
document.write( "Throwing out the negative result, we get the wind velocity as 44.317 mph!!!!!!!! </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );