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      Question

      A boat can cover 200 km in downstream in 10 hours and

      150 km in upstream in 15 hours. Find the distance travelled by the boat in still water in 5 hours.
      A 70 km Correct Answer Incorrect Answer
      B 72 km Correct Answer Incorrect Answer
      C 76 km Correct Answer Incorrect Answer
      D 75 km Correct Answer Incorrect Answer

      Solution

      Downstream speed of the boat = 200/10 = 20 km/hr Upstream speed of the boat = 150/15 = 10 km/hr Speed of boat in still water = (20 + 10)/2 = 15 km/hr Distance travelled by the boat in still water in 5 hours = 15 × 5 = 75 km

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