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Two pipes A and B can fill a cistern in ...

Two pipes A and B can fill a cistern in 12 minutes and 13 ininu4s respectively while a third pipe C can empty the full cistern in 6 minutes. A and Bare kept open for 5 minute in the beginning and the C is also opened. In what time is the cistern emptied? `30\ m in` b. `3\ m in` c. `45\ m in` d. `37 1/2m in`

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