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Question

A cistern can be filled by a tap in 4 hours and emptied by an outlet pipe in 6 hours. How long will it take to fill the cistern if both the tap and the pipe are opened together?

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Solution

Time taken by the tap to fill the cistern=4 hours Tap fills 14th part of the cistern in 1 hour.Time taken by the pipe to empty the cistern=6 hours Pipe empties out 16th part of the cistern in 1 hour.Thus, in 1 hour, 14-16th part of the cistern is filled.We have:14-16=6-424=224=112Thus, in 1 hour, 112th part of the cistern is filled.Hence, the cistern will be filled in 12 hours.

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