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A cistern has two supply pipes A,B and a waste pipe C. Through A and B, the cistern can be filled in 15 minutes and 18 minutes respectively. Through C the full cistern can be emptied in 20 minutes. At first the pipes A and C are opened for 5 minutes. Then the pipe A is closed and the pipe B is opened. How much time is needed to fill the cistern?????only for Ansh bro :)​

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Answer:

A CISTERN has two supply PIPES A,B and a waste pipe C. Through A and B, the cistern can be filled in 15 minutes and 18 minutes respectively. Through C the full cistern can be emptied in 20 minutes. At FIRST the pipes A and C are opened for 5 minutes. Then the pipe A is closed and the pipe B is opened. How much TIME is needed to fill the cistern?????

Explanation:

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