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      Question

      A boat can cover 120 km in downstream in 12 hours and

      100 km in upstream in 10 hours. Find the distance travelled by the boat in still water in 5 hours.
      A 50 km Correct Answer Incorrect Answer
      B 20 km Correct Answer Incorrect Answer
      C 25 km Correct Answer Incorrect Answer
      D 35 km Correct Answer Incorrect Answer

      Solution

      Downstream speed of the boat = 120/12 = 10 km/hr Upstream speed of the boat = 100/10 = 10 km/hr Speed of boat in still water = (10 + 10)/2 = 10 km/hr Distance travelled by the boat in still water in 5 hours = 10 × 5 = 50 km

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