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    Question

    A boat can travel 7.2 km upstream in 18 min. If the

    ratio of the speed of the boat in still water to the speed of the stream is 7:1. How much time will the boat take to cover 17.6 km downstream ?
    A 44 min Correct Answer Incorrect Answer
    B 12 min Correct Answer Incorrect Answer
    C 24 min Correct Answer Incorrect Answer
    D 33 min Correct Answer Incorrect Answer
    E 27 min Correct Answer Incorrect Answer

    Solution

    Speed = 7x : 1x
    Downstream = 8x; upstream = 6x
    Upstream speed = 7.2 x (60/18) = 24 kmph
    6x = 24
    x = 4
    Downstream = 8 x 4 = 32
    Time taken for 17.6 km = 17.6 x (60/32) = 33 min

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