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      Question

      A boat can cover 195 km in downstream in 10 hours and

      140 km in upstream in 14 hours. Find the distance travelled by the boat in still water in 4 hours.
      A 50 km Correct Answer Incorrect Answer
      B 55 km Correct Answer Incorrect Answer
      C 59 km Correct Answer Incorrect Answer
      D 51 km Correct Answer Incorrect Answer

      Solution

      Downstream speed of the boat = 195/10 = 19.5 km/hr Upstream speed of the boat = 140/14 = 10 km/hr Speed of boat in still water = (19.5 + 10)/2 = 14.75 km/hr Distance travelled by the boat in still water in 4 hours = 14.75 Γ— 4 = 59 km

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