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      Question

      Pipes A and B can fill a tank in 12 hours and 20 hours

      respectively. The pipe is an emptying pipe. If A, B and C are opened together for 8 hours, 80% of the tank is filled. Initially, pipe B is opened for 4 hours and then it is closed. Pipes A and C together will fill the remaining part of the tank in _________. 
      A 12 hours Correct Answer Incorrect Answer
      B 15 hours Correct Answer Incorrect Answer
      C 18 hours Correct Answer Incorrect Answer
      D 16 hours Correct Answer Incorrect Answer

      Solution

      The correct answer is D

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