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      Question

      A boat can cover 220 km in downstream in 11 hours and

      126 km in upstream in 18 hours. Find the speed of boat in still water
      A 10.5 km/hr Correct Answer Incorrect Answer
      B 12.5 km/hr Correct Answer Incorrect Answer
      C 13.5 km/hr Correct Answer Incorrect Answer
      D 18.5 km/hr Correct Answer Incorrect Answer

      Solution

      Downstream speed of the boat = 220/11 = 20 km/hr Upstream speed of the boat = 126/18 = 7 km/hr Speed of boat in still water = (20 + 7)/2 = 13.5 km/hr

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