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      Question

      Speed of boat is 15 km/hr. Speed of the stream is 20%

      less than speed of boat. Then find time taken by boat to go 81 km downstream?
      A 3 hrs Correct Answer Incorrect Answer
      B 2.5 hrs Correct Answer Incorrect Answer
      C 5 hrs Correct Answer Incorrect Answer
      D 4 hrs Correct Answer Incorrect Answer

      Solution

      Speed of stream = 15 × (80/100) = 12 km/hr Time taken to go 81 km = 81/(15 + 12) = 3 hrs

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