SOLUTION: Two taps can fill up an empty tank in 15 and 12 hours respectively. another tap z can empty the full tank in 8 hours. if all the tap turned together at the same time, in how many

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Two taps can fill up an empty tank in 15 and 12 hours respectively. another tap z can empty the full tank in 8 hours. if all the tap turned together at the same time, in how many      Log On


   



Question 838643: Two taps can fill up an empty tank in 15 and 12 hours respectively. another tap z can empty the full tank in 8 hours. if all the tap turned together at the same time, in how many hours will the tank be full?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/12+1/15-1/8=1/x
5/60+4/60-1/8=1/x
9/60-1/8=1/x
3/20-1/8=1/x
6/40-5/40=1/x
1/40=1/x
x=40