document.write( "Question 718025: Question:
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Algebra.Com's Answer #440746 by Alan3354(69443)\"\" \"About 
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If a plane can travel 500 miles per hour with the wind and 420 miles per hour against the wind, what is the speed of the plane in still air?
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\n" ); document.write( "It's the average of the 2, (500 + 420)/2 = 460 mi/hr
\n" ); document.write( "It's called airspeed.
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