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      Question

      A boat can cover 180 km in downstream in 9 hours and 110

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

      Solution

      Downstream speed of the boat = 180/9 = 20 km/hr Upstream speed of the boat = 110/11 = 10 km/hr Speed of boat in still water = (20 + 10)/2 = 15 km/hr

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