One pipe fills a storage pool in 12 hours. A second pipe

Last updated: 7/15/2022

One pipe fills a storage pool in 12 hours. A second pipe fills the same pool in 6 hours. When a third pipe is added and all three are used to fill the pool, it takes only 3 hours. Find how long it takes the third pipe to do the job. The third pipe can fill the pool alone in hours. *****