SOLUTION: An oil tank at a refinery has two inlet pipes and one outlet pipe. One inlet pipe can fill the tank in 6h, and the other inlet pipe can fill the tank in 12h. The outlet pipe can em

Question 171652: An oil tank at a refinery has two inlet pipes and one outlet pipe. One inlet pipe can fill the tank in 6h, and the other inlet pipe can fill the tank in 12h. The outlet pipe can empty the tank in 24h. How long would it take to fill the tank with all three pipes open?
Please, hep me with this problem, i'm trying since friday to solve it =( Tank you
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
An oil tank at a refinery has two inlet pipes and one outlet pipe. One inlet pipe can fill the tank in 6h, and the other inlet pipe can fill the tank in 12h. The outlet pipe can empty the tank in 24h. How long would it take to fill the tank with all three pipes open?
:
Let the full tank = 1; + for filling, - for draining
:
Let t = time required when all three pipes are open:
+ - = 1
Multiply equation by 24 to get rid of the denominators, results:
4t + 2t - t = 24
:
5t = 24
t =
t = 4.8 hrs to fill when all pipes are open
:
:
Check solution using a calc:
+ -
.8 + .4 - .2 = 1
:
:
Not that hard, right?

RELATED QUESTIONS
An oil tank has two inlet pipes and one outlet pipe. One inlet pipe can fill the tank in... (answered by nerdybill)

A large water tank has two inlet pipes (large one and small one) and one outlet pipe. It... (answered by ankor@dixie-net.com)

A 400-gallon water storage tank is filled by a single inlet pipe, and two identical... (answered by stanbon)

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. (answered by josgarithmetic)

A large water tank has two inlet pipes of different sizes, and one outlet pipe. With the... (answered by josmiceli)

An Inlet pipe an oil tank in 10 days and a 2nd Inlet pipe can fill the same tank in 12... (answered by josgarithmetic,ikleyn)

Hi The problem: A large water tank has two inlet pipes of different sizes and one... (answered by nerdybill)

An inlet pipe can fill a tank in 3 hours. An outlet pipe can empty the tank in 6 hours. (answered by Alan3354)

a water tank has an inlet pipe (to fill the tank) and an outlet pipe (to empty the tank). (answered by mananth)