Posted by **bob** on Thursday, May 26, 2011 at 2:23am.

Three water pipes are used to fill a swimming pool. The 1st pipe alone takes 8 hours to fill the pool, the 2nd pipe alone takes 12 hours to fill the pool, and the 3rd pipe takes 24 hours to fill the pool. If all 3 pipes are opened at the same time, how long will it take all 3 together to fill the pool?

- math -
**Reiny**, Thursday, May 26, 2011 at 6:53am
rates of each of the pipes are 1/8 pools per hour, 1/12 pools per hour, and 24 pools per hour.

the combined rate would be

(1/8 + 1/12 + 1/24) pools per hour

= 1/4 units per hour

Time using combined rate = 1 pool/(1 pool/4) hours

= 4 hours

(the "pool" unit canceled)

- math -
**Fernando**, Wednesday, July 27, 2016 at 12:07pm
a large pipe can empty a pool in 6hours and a smaller pipe can empty the same pool in 9 hours. how long will it take both pipes to empty the pool.

## Answer This Question

## Related Questions

- maths - To fill a swimming pool two pipes are to be used.If the pipe of larger ...
- math - One pipe can fill a swimming pool in 8 hours. Another pipe takes 12 hours...
- Algebra - One pipe can fill a swimming pool in 8 hours. Another pipe takes 12 ...
- math - One pipe fills a storage pool in 20 hours. A second pipe fills the same ...
- Maths - Pipe A takes twice the time to fill up the pool as pipe B does.The pool ...
- Algebra - An inlet pipe on a swimming pool can be used to fill the pool in 24 ...
- MATHS - Pipe A can fill a swimming pool in 10 hours.Pipe B can fill the same ...
- College Math - An inlet pipe on a swimming pool can be used to fill the pool in ...
- math - An inlet pipe on a swimming pool can be used to fill the pool in 28 hours...
- Math - An inlet pipe on a swimming pool can be used to fill the pool in 24 hours...

More Related Questions