SOLUTION: A tank can be emptied thru either of 2 pipes, the 1st pipe empties the tank in 4hours. The 2nd pipe empties in 3hours. how long will it take to emptythe tank using both pipes

Question 85282: A tank can be emptied thru either of 2 pipes, the 1st pipe empties the tank in 4hours. The 2nd pipe empties in 3hours. how long will it take to emptythe tank using both pipes
Found 2 solutions by stanbon, Lacey020991:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A tank can be emptied thru either of 2 pipes, the 1st pipe empties the tank in 4hours. The 2nd pipe empties in 3hours. how long will it take to emptythe tank using both pipes
-----------------------
1st Pipe DATA:
Time = 4 hours/job ; Rate = 1/4 job/hr
--------------
2nd Pipe DATA:
Time = 3 hours/job ; Rate = 1/3 job/hr
--------------
Together DATA;
Time = x hours/job ; Rate = 1/x job/hr
----------------
EQUATION:
rate + rate = together rate
1/4 + 1/3 =1/x
7/12 = 1/x
x= 12/7 = 1 hr (5/7)*60 minutes
x = 1 hr 42.86 minutes ( Time to empty the tank if both pipes are open)
===============
Cheers,
Stan H.
Answer by Lacey020991(49) (Show Source): You can put this solution on YOUR website!

RELATED QUESTIONS
2 pipes are connected to a tank. On pipe fills the tank in 7 hours. The second pipe... (answered by Earlsdon)
2 pipes are connected to a tank. One pipe fills the tank in 7 hours. The second pipe... (answered by Alan3354)
A pipe fills 1 tank in 4 h. If a second pipe empties 1 tank in 6 h. How long does it take (answered by josmiceli)
A pipe fills a tank in 8 hours. Another pipe empties the tank in 12 hours. If both pipes (answered by nerdybill)
pipe a is an inlet pipe filling the tank at t l/h. pipe b empties the tank in 3 hours..... (answered by ikleyn)
pipe A can fill an empty water tank in 3hours, while pipe B can fill the same tank in 6... (answered by ikleyn)
Filling a tank. A water tank has an inlet pipe and a drain pipe. A full tank can be... (answered by jim_thompson5910)
Filling a tank. A water tank has an inlet pipe and a drain pipe. A full tank can be... (answered by scott8148)
Filling a tank. A water tank has an inlet pipe and a drain pipe. A full tank can be... (answered by stanbon)