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    Question

    When travelling downstream, a boat takes 5 hours to

    travel 300 km. If the speed of the stream is (2/5)th of downstream speed of the boat, then find the time taken by the boat to cover 360 km in still water.
    A 12 hours Correct Answer Incorrect Answer
    B 20 hours Correct Answer Incorrect Answer
    C 10 hours Correct Answer Incorrect Answer
    D 15 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 300/5 = 60 km/hr Speed of the stream = 60 x (2/5) = 24 km/hr So, speed of the boat in still water = 60 – 24 = 36 km/hr Required time taken = 360/36 = 10 hours

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