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    Question

    The speed of a boat in still water is 11 km/hr and the

    speed of the stream is 3 km/hr. A man rows to a place at a distance of 56 km and comes back to the starting point. The total time taken by him is:
    A 8 hours Correct Answer Incorrect Answer
    B 13 hours Correct Answer Incorrect Answer
    C 11 hours Correct Answer Incorrect Answer
    D 10 hours Correct Answer Incorrect Answer
    E 14 hours Correct Answer Incorrect Answer

    Solution

    Rate downstream = (11 + 3) kmph = 14 kmph Rate upstream = (11 – 3) kmph = 8 kmph According to the question, Time = Distance/Speed Hence, Required time = 56/14 + 56/8 = 4 + 7 = 11 hours

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