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

Comments and Answers (2)

Richa

Richa

does anyone know the correct answer

Jasmine

Jasmine

how did the answer came

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