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    Question

    The speed of a boat in still water increases by 4

    km/hour after each hour. The speed of stream is 3 km/hour. If the boat travelled 60 km in 3 hours in downstream, then find time taken by the boat to cover 96 km distance with the initial speed of boat in downstream
    A 5 km/hr Correct Answer Incorrect Answer
    B 2 km/hr Correct Answer Incorrect Answer
    C 6 km/hr Correct Answer Incorrect Answer
    D 12 km/hr Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    Let the initial speed of boat in still water be = x km/hr  (x + 3) + (x + 7) + (x + 11) = 60  3x + 21 = 60 3x = 39 x = 13 km/hr Required time will be = 96/16 = 6 km/hr

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