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math

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In a storm, a plane flew against the wind and took 9 hours to cover 3,600 miles. The return trip, traveling with the wind, took 1 hour less. find the air speed of the plane, and the speed of the wind.

  • math -

    Speed of plane --- x mph
    speed of wind ---- y mph

    9(x-y) = 3600
    x-y = 400

    8(x+y) = 3600
    x+y = 450

    add them:
    2x = 850
    x = 425 , and y = 25

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