document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=890887>Question 890887</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An aircraft flies downwind from A to B with speed of 400mph for 2 hours and returns in absence of wind in 2.5 hours. What is the wind speed?<BR>\n" );
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document.write( "Let's forget about the technical definitions of the terms air speed and ground speed.  This is a problem for learning how to do math; it is clear what the intended meaning is.<br><BR>\n" );
document.write( "Flying with the wind, the plane flew for 2 hours at 400mph; that is 2*400 = 800 miles.<br><BR>\n" );
document.write( "Flying the same distance of 800 miles back, the trip took 2.5 hours.  The speed is 800/2.5 = 320mph.<br><BR>\n" );
document.write( "The difference in the two speeds is the speed of the wind: 400-320 = 80mph.<br><BR>\n" );
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