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Q: Pipes A and B can fill a tank in 12 hours respectively and pipe C can empty the full tank in 24 hours. All three pipes are opened together, but after 4 hours pipe B is closed. In how many hours, the empty tank will be completely filled ?
  • A. 18
  • B. 32
  • C. 28
  • D. 14
Correct Answer: Option A -
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Explanations:

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