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March 25, 2017

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Flying with wind, a plane flew 800 miles in 5 hrs. Flying against the wind, the plane flew the same distance in 8 hrs. Find the still air speed and wind speed.

  • Algebra - ,

    If the plane's air speed is s, and the wind speed is w

    800/(s+w) = 5
    s+w = 160

    800/(s-w) = 8
    s-w = 100

    2s=260
    s=130
    so, w=30

    800/160 = 5
    800/100 = 8

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