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      Question

      The speed of the stream is 12 km/h. Boat β€˜A’ covers

      160 km distance against the stream in 8 hours and boat β€˜B’ covers 84 km distance against the stream in 7 hours. The speed of boat β€˜B’ in still water is how much percent of the speed of boat β€˜A’ in still water?
      A 70% Correct Answer Incorrect Answer
      B 30% Correct Answer Incorrect Answer
      C 60% Correct Answer Incorrect Answer
      D 75% Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Speed of boat β€˜A’ upstream = 160/8 = 20 km/h Speed of boat β€˜B’ upstream = 84/7 = 12 km/h Speed of the boat β€˜A’ in still water = 20 + 12 = 32 km/h Speed of the boat β€˜B’ in still water = 12 + 12 = 24 km/h Required percentage = (24/32) Γ— 100 = 75%

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