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    Question

    The speed of a boat in still water is 30 km/hr. If the

    boat covers 180 km in upstream in 12 hours, then find the time taken by the boat to travel 180 km in downstream.
    A 5 hours Correct Answer Incorrect Answer
    B 6 hours Correct Answer Incorrect Answer
    C 4 hours Correct Answer Incorrect Answer
    D 7 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 ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 180/12 = 15 km/hr Or, 30 – y = 15 Or, y = 30 – 15 = 15 km/hr Therefore, downstream speed of the boat = 30 + 15 = 45 km/hr Required time taken = 180/45 = 4 hours

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