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    Question

    A Boy can swim 12 km/hr in still water. If the velocity

    of the stream is 6 km/hr, the time taken by him to swim a place 28 km upstream and back is
    A 76/9 hr Correct Answer Incorrect Answer
    B 11/2 hr Correct Answer Incorrect Answer
    C 56/9 hr Correct Answer Incorrect Answer
    D 61/8 hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Rate downstream = 12 + 6 = 18 km/hr Rate upstream = 12 – 6 = 6 km/hr ∴ Required time = 28/18 + 28/6 = 56/9 = `6(2)/9` hr.

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