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      Question

      Boat β€˜A’ can cover 250 km in still water in 10

      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 5 km/hr then find the time taken by boat β€˜B’ to cover the 275 km in downstream.
      A 11 hours Correct Answer Incorrect Answer
      B 10 hours Correct Answer Incorrect Answer
      C 13 hours Correct Answer Incorrect Answer
      D 12 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Speed of boat β€˜A’ in still water = 250/10 = 25 km/hr Speed of boat β€˜B’ in still water = 25 Γ— (4/5) = 20 km/hr Downstream speed of boat β€˜B’ = 20 + 5 = 25 km/hr Time taken by boat β€˜B’ to cover 275 km in downstream = 275/25 = 11 hours

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