A cistern can be filled by a tap in 4 hours and emptied by an outlet p – InterviewSolution

1.	A cistern can be filled by a tap in 4 hours and emptied by an outlet pipe in 9 hours. If both the tap and the pipe are opened together, how long will it take to fill the cistern?
Answer» A cistern can be filled by a tap in 4 hours and emptied by an outlet pipe in 9 hours. If both the tap and the pipe are opened together, how long will it take to fill the cistern?

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