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    Question

    The speed of a boat in calm water is 21 km/h. If the

    speed of the stream is 3 km/h, how long will it take for the boat to travel 63 km against the current?
    A 3.5 hrs Correct Answer Incorrect Answer
    B 5.5 hrs Correct Answer Incorrect Answer
    C 7.2 hrs Correct Answer Incorrect Answer
    D 4.2 hrs Correct Answer Incorrect Answer

    Solution

    ATQ, Upstream speed of boat = 21 - 3 = 18 km/h Required time = (63/18) = 3.5 hours

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