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Two pipes A and B can separately fill a cistern in 10 and 15 minutes respectively. A person opens both the pipes together when the cistern should have been was full he finds the waste pipe open. He then closes the waste pipe and in another 4 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill
🗓 Dec 7, 2021
votes
Sierra
🌐 India
hmm, where is the explanation
votes
Abigail
🌐 India
Please please explain this answer to me
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