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      Question

      A boat can cover 80 km in upstream in 8 hours and 50 km

      in downstream in 2 hours. Find the speed of the stream.
      A 4.5 km/hr Correct Answer Incorrect Answer
      B 7.5 km/hr Correct Answer Incorrect Answer
      C 9.5 km/hr Correct Answer Incorrect Answer
      D 8.5 km/hr Correct Answer Incorrect Answer

      Solution

      Downstream speed = 50/2 = 25 km/hr Upstream speed = 80/8 = 10 km/hr Speed of stream = (25 – 10)/2 = 7.5 km/hr

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