SOLUTION: A swimming pool has 2 inlet pipes. One fills the pool in 4 hours, the other in 6 hours. The outlet pipe empties the pool in 5 hours. Once the outlet pipe was left open when the poo

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A swimming pool has 2 inlet pipes. One fills the pool in 4 hours, the other in 6 hours. The outlet pipe empties the pool in 5 hours. Once the outlet pipe was left open when the poo      Log On


   

Question 1198002: A swimming pool has 2 inlet pipes. One fills the pool in 4 hours, the other in 6 hours. The outlet pipe empties the pool in 5 hours. Once the outlet pipe was left open when the pool was being filled. In how many hours was the pool full? Show all the calculations and modelling used detailing how you get to the answer
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
The three pipes open at the same time, filling rate is
1%2F4%2B1%2F6-1%2F5pool%2Fhours
15%2F60%2B10%2F60-12%2F60
%2825-12%29%2F60
13%2F60

Reciprocal is how many HOURS for 1 POOL.
60%2F13
4 hours 37 minutes