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    Question

    A boy can swim in water with a speed of 12 km/hr in

    still water. If the speed of the stream is 6 km/hr, what will be the time taken by the boy to cover 72 km downstream?
    A 2 hrs Correct Answer Incorrect Answer
    B 3 hrs Correct Answer Incorrect Answer
    C 5 hrs Correct Answer Incorrect Answer
    D 4 hrs Correct Answer Incorrect Answer

    Solution

    Downstream Speed = (12 + 6) km/hr = 18 km/hr Time taken = 72/18 = 4 hours

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