Question

    A boy can swim in still water at a speed of 7 km/hr. If

    the speed of the current would have been 5 km/hr, then the boy could swim 36 km
    A downstream in 5 hrs Correct Answer Incorrect Answer
    B upstream in 7 hrs Correct Answer Incorrect Answer
    C downstream in 3 hrs Correct Answer Incorrect Answer
    D upstream in 4 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Rate downstream = 7 + 5 = 12 kmph Rate upstream = 7 – 5 = 2 kmph Time taken in swimming 36 km downstream = 36/12 = 3 hours Time taken in swimming 36 km upstream = 36/2 = 18 hours From, given options, boy can swim 36 km downstream in 3 hrs.

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