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      Question

      Boat β€˜A’ can cover 160 km in still water in 8 hours.

      In still water, if the ratio of the speed of boat β€˜A’ to that of β€˜B’ is 2:3 and the speed of stream is 5 km/hr then find the time taken by boat β€˜B’ to cover the 350 km in downstream.
      A 10 hours Correct Answer Incorrect Answer
      B 9 hours Correct Answer Incorrect Answer
      C 8 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 = 160/8 = 20 km/hr Speed of boat β€˜B’ in still water = 20 Γ— (3/2) = 30 km/hr Downstream speed of boat β€˜B’ = 30 + 5 = 35 km/hr Time taken by boat β€˜B’ to cover 350 km in downstream = 350/35 = 10 hours

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