document.write( "Question 1004392: If a plane can travel 470 miles per hour with the wind and 430 miles per hour against the wind, find the speed of the plane in still air. \n" ); document.write( "

Algebra.Com's Answer #620896 by Alan3354(69443) $\"\"$ $\"About$

You can put this solution on YOUR website!
If those are the groundspeeds, the plane's airspeed is the average of the 2. \n" ); document.write( "

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