document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=478622>Question 478622</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. A plane travels from Orlando to Denver and back again. On the five-hour trip from Orlando to Denver, the plane has a tailwind of 40 miles per hour.  On the return trip from Denver to Orlando, the plane faces a headwind of 40 miles per hour. This trip takes six hours. What is the speed of the airplane in still air? \r<BR>\n" );
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document.write( "Show full equation please, I'd like to fully understand it.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #327938 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=327938\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A plane travels from Orlando to Denver and back again. <BR>\n" );
document.write( "On the five-hour trip from Orlando to Denver, the plane has a tailwind of 40 miles per hour.<BR>\n" );
document.write( " On the return trip from Denver to Orlando, the plane faces a headwind of 40 miles per hour.<BR>\n" );
document.write( " This trip takes six hours. What is the speed of the airplane in still air? <BR>\n" );
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document.write( "Let s = plane speed in still air<BR>\n" );
document.write( "then<BR>\n" );
document.write( "(s+40) = effective speed with the wind<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(s-40) = effective speed against<BR>\n" );
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document.write( "The two trips are the same distance, write a distance equation Dist = speed * time<BR>\n" );
document.write( "6(s-40) = 5(s+40)<BR>\n" );
document.write( "6s - 240 = 5s + 200<BR>\n" );
document.write( "6s - 5s = 200 + 240<BR>\n" );
document.write( "s = 440 mph in still air<BR>\n" );
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document.write( "Check this by finding the actual distances, they should be the same<BR>\n" );
document.write( "6*400 = 2400 mi<BR>\n" );
document.write( "5*480 = 2400 mi </SPAN>\n" );
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