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    Question

    A man can swim at the rate of 6 km/hr in still water. If

    the speed of the water is 3 km/hr, then the time taken by him to swim 12 km upstream is
    A 4 hr Correct Answer Incorrect Answer
    B 7 hr Correct Answer Incorrect Answer
    C 8 hr Correct Answer Incorrect Answer
    D 5 hr Correct Answer Incorrect Answer
    E 6 hr Correct Answer Incorrect Answer

    Solution

    Rate upstream = 6 – 3 = 3 km/hr Distance upstream = 12 km Hence, required time = distance/speed = 12/3 = 4 hours

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