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Q: Pipes A and B can fill a tank in 30 and 20 minutes respectively. There is also an emptying pipe C attached to the tank. If all the three pipes are opened together, the tank is filled in 15 minutes. If the tank is one-third empty, then C alone will empty the tank completely in
  • A. 20 minutes
  • B. 30 minutes
  • C. 40 minutes
  • D. 60 minutes
Correct Answer: Option C -
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Explanations:

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