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Q: Pipes P and Q can fill a tank in 18 and 27 minutes, respectively, whereas pipe R can empty the full tank in 54 minutes. P and Q were opened together for 6 minutes and then closed and R was opened. The tank was emptied by R alone in:
  • A. 35 minutes
  • B. 45 minutes
  • C. 30 minutes
  • D. 40 minutes
Correct Answer: Option C -
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Explanations:

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