SOLUTION: It takes 6 hours to fill a tank, 8 hours to empty a tank. If both valves are open, how long does it take to fill the tank? I don't want the answer I just want help on setting up

Algebra ->  Rate-of-work-word-problems -> SOLUTION: It takes 6 hours to fill a tank, 8 hours to empty a tank. If both valves are open, how long does it take to fill the tank? I don't want the answer I just want help on setting up       Log On


   



Question 405087: It takes 6 hours to fill a tank, 8 hours to empty a tank. If both valves are open, how long does it take to fill the tank? I don't want the answer I just want help on setting up the problem. thank you for your time and help
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
It takes 6 hours to fill a tank, 8 hours to empty a tank.
If both valves are open, how long does it take to fill the tank?
:
Let t = time required to fill the tank with both valve oper
Let the completed job = 1 (a full tank)
:
to fill: +, to empty: -
;
The equation:
t%2F6 - t%2F8 = 1