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    Question

    The speed of a boat in still water is 16 km/hr. If the

    boat covers 180 km in upstream in 12 hours, then find the time taken by the boat to travel 170 km in downstream.
    A 12 hours Correct Answer Incorrect Answer
    B 10 hours Correct Answer Incorrect Answer
    C 15 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) = 180/12 = 15 km/hr Or, 16 тАУ y = 15 Or, y = 16 тАУ 15 = 1 km/hr Therefore, downstream speed of the boat = 16 + 1 = 17 km/hr Required time taken = 170/17 = 10 hours

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