Two pipes A and B and can fill a cistern in 15 minutes and 20 minutes respectively but a third pipe c can empty the full tank in 10 minutes. A and B are kept open for 5 minutes in the beginning and then c is also opened. In what time is the cistern emptied.

Options
- 35 minute
- 40 minute
- 45 minute
- 50 minute

CORRECT ANSWER : 35 minute

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