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    Question

    A boat travels 600 metres against the stream in 20

    seconds and returns the same distance with the stream in 15 seconds. Determine the speed of the boat in still water.
    A 35 m/s Correct Answer Incorrect Answer
    B 25 m/s Correct Answer Incorrect Answer
    C 19 m/s Correct Answer Incorrect Answer
    D 45 m/s Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of boat in upstream = (600 / 20) = 30 m/s

    Speed of boat in downstream = (600 / 15) = 40 m/s

    Speed of the boat in still water = [(30 + 40) / 2] = 35 m/s

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