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    Question

    A man can go on a motor boat with a speed of 25 km/hour

    in still water to a certain upstream point and come back to the starting point in a river which flows at a speed of 15km/hour. Find  the average speed of motor boat for total journey?
    A 16 km/hour Correct Answer Incorrect Answer
    B 13 km/hour Correct Answer Incorrect Answer
    C 18 km/hour Correct Answer Incorrect Answer
    D 21 km/hour Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

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