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1473

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 :

  • 1
    35 minutes
  • 2
    45 minutes
  • 3
    30 minutes
  • 4
    40 minutes
  • Show Answer
  • Workspace

Answer : 3. "30 minutes"

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