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      Question

      A swimmer, whose speed in 15 km/h in still water goes 30

      km downstream and comes back. He takes 4 hours 30 minutes for the whole journey. What is the speed of the stream, in km/h?
      A 3 Correct Answer Incorrect Answer
      B 5 Correct Answer Incorrect Answer
      C 6 Correct Answer Incorrect Answer
      D 4 Correct Answer Incorrect Answer

      Solution

      The correct answer is B

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