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      Question

      If Boat goes 80 km upstream in 4 hours and 60 km

      downstream in 2 hours, then the speed of the boat in still water is
      A 10 Correct Answer Incorrect Answer
      B 5 Correct Answer Incorrect Answer
      C 25 Correct Answer Incorrect Answer
      D 15 Correct Answer Incorrect Answer
      E 20 Correct Answer Incorrect Answer

      Solution

      Let the speed of boat = x and the speed of the stream = y 80/(x - y) = 4 => x - y = 20 60/(x + y) = 2 => x + y = 30 From above x = 25 km/hr

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