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      Question

      Boat β€˜A’ can cover 120 km in still water in 12

      hours. In still water, if the ratio of the speed of boat β€˜A’ to that of β€˜B’ is 5:4 and the speed of stream is 3 km/hr then find the time taken by boat β€˜B’ to cover the 264 km in downstream.
      A 20 hours Correct Answer Incorrect Answer
      B 22 hours Correct Answer Incorrect Answer
      C 24 hours Correct Answer Incorrect Answer
      D 21 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Speed of boat β€˜A’ in still water = 120/12 = 10 km/hr Speed of boat β€˜B’ in still water = 10 Γ— (4/5) = 8 km/hr Downstream speed of boat β€˜B’ = 8 + 3 = 11 km/hr Time taken by boat β€˜B’ to cover 264 km in downstream = 264/11 = 24 hours

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