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    Question

    The speed of motorboat in still water is 45 km/hr. It

    takes 5 hours to go 200 km upstream. Find the time taken by the motorboat to return the same distance.
    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 stream = x km/hr The speed of the motorboat in upstream = (45 – x) km/hr Distance = speed × time => 200 = (45 – x) × 5 => x = 5 km/hr While returning the motorboat will go in downstream, The speed of the motorboat in downstream = (45 + 5) = 50 km/hr The required time taken = 200/50 = 4 hours

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