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    Question

    A boat covers a distance of 900 metres upstream in 36

    seconds and the same distance downstream in 24 seconds. Find the speed of the boat in still water.
    A 31.25 m/s Correct Answer Incorrect Answer
    B 22.5 m/s Correct Answer Incorrect Answer
    C 11.29 m/s Correct Answer Incorrect Answer
    D 45.5 m/s Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of boat in upstream = (900 / 36) = 25 m/s

    Speed of boat in downstream = (900 / 24) = 37.5 m/s

    Speed of the boat in still water = [(25 + 37.5) / 2] = 31.25 m/s

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