# Solution: How long will it take to fill an empty tank with all pipes in operation?

A tank can be filled in 9 hours by one pipe, 12 hours by a second pipe and can be drained when full by a third pipe in 15 hours. How long will it take to fill an empty tank with all pipes in operation? How to solve work problems?

#### Problem Statement:

A tank can be filled in 9 hours by one pipe, 12 hours by a second pipe and can be drained when full by a third pipe in 15 hours. How long will it take to fill an empty tank with all pipes in operation?

It will take 7 hours and 50 minutes to fill an empty tank with all pipes in operation.

Solution:

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