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    Question

    The speed of a boat in still water is  15 km/h , and

    the speed of the stream is  3 km/h . How much time will it take to travel  36 km upstream  and  54 km downstream ?
    A 1 hrs Correct Answer Incorrect Answer
    B 3 hrs Correct Answer Incorrect Answer
    C 6 hrs Correct Answer Incorrect Answer
    D 9 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Upstream speed = 15 − 3 = 12 km/h Downstream speed = 15 + 3 = 18 km/h Time upstream = 36 / 12 = 3 hours Time downstream = 54 / 18 = 3 hours Total time = 3 + 3 = 6 hours

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