SOLUTION: One pipe can fill a tank in 40 hours, while a second pipe can fill the same tank in 32 hours. How long would it take both pipes working together to fill the tank?

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Question 459485: One pipe can fill a tank in 40 hours, while a second pipe can fill the same tank in 32 hours. How long would it take both pipes working together to fill the tank?
Found 2 solutions by solver91311, richwmiller:
Answer by solver91311(16868) About Me  (Show Source):
You can put this solution on YOUR website!

If A can do a job in x time periods, then A can do of the job in 1 time period. Likewise, if B can do the same job in y time periods, then B can do of the job in 1 time period.

So, working together, they can do



of the job in 1 time period.

Therefore, they can do the whole job in:



time periods.



John

My calculator said it, I believe it, that settles it
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Answer by richwmiller(9132) About Me  (Show Source):
You can put this solution on YOUR website!
x/40+x/32=1
x/5+x/4=8
4x+5x=160
9x=160
x=160/9