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    Question

    The speed of a boat in still water is 40 km/hr. If the

    boat covers 360 km in upstream in 12 hours, then find the time taken by the boat to travel 150 km in downstream.
    A 3 hours Correct Answer Incorrect Answer
    B 2 hours Correct Answer Incorrect Answer
    C 4 hours Correct Answer Incorrect Answer
    D 5 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the speed of the boat in still water and the speed of the current be тАШxтАЩ km/hr and тАШyтАЩ km/hr, respectively Upstream speed of the boat = (x тАУ y) = 360/12 = 30 km/hr Or, 40 тАУ y = 30 Or, y = 40 тАУ 30 = 10 km/hr Therefore, downstream speed of the boat = 40 + 10 = 50 km/hr Required time taken = 150/50 = 3 hours

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