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    Question

    A boat covers 180 km downstream in 5 hours. If the speed

    of the boat in upstream is one-third of its downstream speed, then how much time will it take to travel 144 km upstream?
    A 12 hrs Correct Answer Incorrect Answer
    B 18 hrs Correct Answer Incorrect Answer
    C 5 hrs Correct Answer Incorrect Answer
    D 9 hrs Correct Answer Incorrect Answer

    Solution

    ATQ,

    Downstream speed of the boat = 180 / 5 = 36 km/h

    Therefore, upstream speed of the boat = 36 / 3 = 12 km/h

    Required time taken = 144 / 12 = 12 hours

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