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Q: Pipes A and B are filling pipes while pipe C is an emptying pipe. A and B can fill a tank in 72 and 90 minutes respectively. When all the three pipes are opened together, the tank gets filled in 2 hours. A and B are opened together for 12 minutes, then closed and C is opened. The tank will be empty after :
  • A. 12 minutes
  • B. 15 minutes
  • C. 18 minutes
  • D. 16 minutes
Correct Answer: Option C -
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Explanations:

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