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      Question

      A boat can cover 140 km in downstream in 14 hours and 96

      km in upstream in 12 hours. Find the distance travelled by the boat in still water in 5 hours.
      A 45 km Correct Answer Incorrect Answer
      B 40 km Correct Answer Incorrect Answer
      C 42 km Correct Answer Incorrect Answer
      D 43 km Correct Answer Incorrect Answer

      Solution

      Downstream speed of the boat = 140/14 = 10 km/hr Upstream speed of the boat = 96/12 = 8 km/hr Speed of boat in still water = (10 + 8)/2 = 9 km/hr Distance travelled by the boat in still water in 5 hours = 9 × 5 = 45 km

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