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      Question

      A boat can cover 140 km in downstream in 7 hours and 130

      km in upstream in 13 hours. Find the speed of boat in still water.
      A 15 km/hr Correct Answer Incorrect Answer
      B 10 km/hr Correct Answer Incorrect Answer
      C 12 km/hr Correct Answer Incorrect Answer
      D 11 km/hr Correct Answer Incorrect Answer

      Solution

      Downstream speed of the boat = 140/7 = 20 km/hr Upstream speed of the boat = 130/13 = 10 km/hr Speed of boat in still water = (20 + 10)/2 = 15 km/hr

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