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      Question

      A boat covers 60 km downstream in 3 hours and 36 km

      upstream in 3 hours. Speed of the boat in still water is:
      A 18 km/h Correct Answer Incorrect Answer
      B 12 km/h Correct Answer Incorrect Answer
      C 16 km/h Correct Answer Incorrect Answer
      D 25 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Downstream speed = 60/3 = 20 km/h Upstream speed = 36/3 = 12 km/h Speed in still water = (20 + 12)/2 = 16 km/h

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