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    Question

    When travelling downstream, a boat takes 6 hours to

    travel 240 km. If the speed of the stream is (3/8)th of downstream speed of the boat, then find the time taken by the boat to cover 300 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 = 240/6 = 40 km/hr Speed of the stream = 40 x (3/8) = 15 km/hr So, speed of the boat in still water = 40 – 15 = 25 km/hr Required time taken = 300/25 = 12 hours

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