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maths-equation

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a man travels some distance at a speed of 12km/hr and returns at 9km/hr .if the total time taken by him is 2hrs 20 min ,find the distance.

  • maths-equation -

    time for first part = d/12
    time for return = d/9

    d/12 + d/9 = 7/3
    times 36
    3d + 4d = 84
    7d = 84
    d = 12

    the distance was 12 km

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