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    Question

    A boat goes 200 km with the current in 10 hours, and

    returns the same distance against the current in 20 hours. Find the speed of the boat in still water.
    A 18 km/h Correct Answer Incorrect Answer
    B 12 km/h Correct Answer Incorrect Answer
    C 15 km/h Correct Answer Incorrect Answer
    D 24 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of boat in downstream = 200 / 10 = 20 km/h Speed of boat in upstream = 200 / 20 = 10 km/h Speed of boat in still water = (20 + 10) / 2 = 30 / 2 = 15 km/h

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