document.write( "Question 373590: 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.\r
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Algebra.Com's Answer #265887 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "Let x represent the speed of the plane in still air & y the speed of the wind
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document.write( "Question states
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document.write( "x + y = 470mph
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document.write( "x - y = 430mph
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document.write( "Adding the equations together
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document.write( "2x = 900mph
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document.write( "x = 450mph, the speed of the plane in still air   \n" );
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