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14 June, 21:09

At maximum speed, an airplane travels 1680 miles against the wind in 5 hours. Flying with the wind, the plane can travel the same distance in 4 hours.

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  1. 14 June, 23:27
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    D=vt

    1680=5 (p-w)

    p-w=336

    1680=4 (p+w)

    p+w=420

    p-w+p+w=336+420

    2p=756

    p=378 mph, and since w=420-p

    w=42 mph

    So the plane's velocity in still air is 378 mph and the wind speed is 42mph.
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