document.write( "Question 563848: if a plane travels 490 mph with the wind and 410 mph against the wind what is the speed of the plane in still air?
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\n" ); document.write( "Thank you!
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Algebra.Com's Answer #365090 by Alan3354(69443)\"\" \"About 
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if a plane travels 490 mph with the wind and 410 mph against the wind what is the speed of the plane in still air?
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\n" ); document.write( "The plane's airspeed is the average, 450 mi/hr
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\n" ); document.write( "a + w = 490
\n" ); document.write( "a - w = 410
\n" ); document.write( "--> a = 450
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