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    Question

    The speed of a boat in still water is  12 km/h , and

    the speed of the stream is  3 km/h . How much time will it take to travel  30 km upstream  and  30 km downstream ?
    A 5⅓ hours Correct Answer Incorrect Answer
    B 7⅓ hours Correct Answer Incorrect Answer
    C 2⅓ hours Correct Answer Incorrect Answer
    D 3⅓ hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Upstream speed = 12 − 3 = 9 km/h Downstream speed = 12 + 3 = 15 km/h Time upstream = 30 / 9 = 10/3 hours Time downstream = 30 / 15 = 2 hours Total time = 10/3 + 2 = 10/3 + 6/3 = 16/3 hours = 5⅓ hours

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