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      Question

      Mr. Arun rows a boat with the stream at 10 km/hr and

      against the stream in 5 km/hr. In still water, his rate of rowing in km/h is:
      A 7.5 Correct Answer Incorrect Answer
      B 2.5 Correct Answer Incorrect Answer
      C 5 Correct Answer Incorrect Answer
      D 15 Correct Answer Incorrect Answer

      Solution

      Let the man's speed is 'x' and that of stream flow is 'y'. Then, x + y = 10 ----- (i) => x - y = 5 ------ (ii) Solving (i) and (ii) we get, => x = 7.5 km/hr

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