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    Question

    The speed of a boat in still water is 35 km/hr. If the

    boat covers 150 km in upstream in 5 hours, then find the time taken by the boat to travel 200 km in downstream.
    A 4 hours Correct Answer Incorrect Answer
    B 3 hours Correct Answer Incorrect Answer
    C 5 hours Correct Answer Incorrect Answer
    D 3.5 hours 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) = 150/5 = 30 km/hr Or, 35 – y = 30 Or, y = 35 – 30 = 5 km/hr Therefore, downstream speed of the boat = 35 + 5 = 40 km/hr Required time taken = 200/40 = 5 hours

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