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    Question

    In still water, a boat travels 63 km in 3 hours. If the

    speed of the stream is 6 km/h, then what is the percentage increase of downstream speed compared to upstream speed?
    A 55% Correct Answer Incorrect Answer
    B 45% Correct Answer Incorrect Answer
    C 80% Correct Answer Incorrect Answer
    D 95% Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of the boat in still water = 63 ÷ 3 = 21 km/h

    Downstream speed = 21 + 6 = 27 km/h

    Upstream speed = 21 - 6 = 15 km/h

    Required percentage = {(27 - 15)/15} × 100 = (12/15) × 100 = 80%

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