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23 July, 15:08

At maximum speed, an airplane travels 2,400 miles against the wind in 6 hours. Flying with the wind, the plane can travel the same distance in 5 hours. Let x be the maximum speed of the plane and y be the speed of the wind. What is the speed of the plane with no wind?

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  1. 23 July, 15:18
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    X - y = 2400/6 = 400 where x = speed of plane and y = speed of wind.

    x + y = 2400/5 = 480 - flying with the wind

    adding the 2 equations

    2x = 880

    x = 440

    Speed of the plane with no wind = 440 mph
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