Multiple Choice Questions on If a body covers a distance at the rate of x km h and another equal distance at the rate of y km h t........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

If a body covers a distance at the rate of x km h and another equal distance at the rate of y km h t...........

Quant (SSC) Time & distance
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    If a body covers a distance at the rate of x km/h and another equal distance at the rate of y km/h, then the average speed (in km/h) is

    x + y/2

    Incorrect Answer

    √x

    Incorrect Answer

    x + y /xy

    Incorrect Answer

    2xy /x + y

    Correct Answer
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    Explanation:

    Let the distance be 1 Km. then,
    Average speed = Total distance travelled / Total time taken
    = 1 + 1 /(1/x + 1/y)
    = 2 /(x + y/xy)
    = 2xy /x + y

    By: Amit Kumar
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