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    lisabrummel's Avatar
    lisabrummel Posts: 1, Reputation: 1
    New Member

    Dec 20, 2011, 07:55 AM
    Help distance rate time problems?
    An airplane flies 500 mi/hr in still air. Flying with the jet stream, the plane travels 1200 my from City A to City B. The plane then returns to City A,flying against the jet stream. The round-tip flight time is 5 h. What is the speed of the jet steam in miles per hour?
    Aurora2000's Avatar
    Aurora2000 Posts: 111, Reputation: 16
    Junior Member

    Dec 20, 2011, 08:08 AM
    Let be x the speed of jet stream (in mph):

    in the going out trip the plane travels 1200 miles at (500+x) mph, thus travel time is
    ; in the return trip the plane travels 1200 miles at (500-x) mph,
    thus travel time is . Round trip time is 5h, thus

    Solve in x.

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