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      Question

      A boat can cover 120 km in upstream in 4 hours and 144

      km in downstream in 3 hours. Find the speed of the stream.
      A 12 km/hr Correct Answer Incorrect Answer
      B 13 km/hr Correct Answer Incorrect Answer
      C 9 km/hr Correct Answer Incorrect Answer
      D 8 km/hr Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Downstream speed = 144/4 = 48 km/hr Upstream speed = 120/4 = 30 km/hr Speed of stream = (48 – 30)/2 = 9 km/hr

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