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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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