SOLUTION: 3 pipes fill a tank in 0.375 hours. If 2 of them take 1.25 hours and 10/7 hours respectively to fill it alone, how many hours will the 3rd pipe take to fill it alone?

Question 992309: 3 pipes fill a tank in 0.375 hours. If 2 of them take 1.25 hours and 10/7 hours respectively to fill it alone, how many hours will the 3rd pipe take to fill it alone?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of filling to get their
rate filling together
1st pipe's rate:
[ 1 tank filled ] / [ 1.25 hrs ]
2nd pipe's rate:
[ 1 tank filled ] / [ 10/7 hrs ]
3rd pipe's rate:
[ 1 tank filled ] / [ t hrs ]
All 3 pipes together:
[ 1 tank filled ] / [ .375 hrs ]
-------------------------

Multiply both sides by

hrs
The 3rd pipe will take 6/7 hrs to fill
the tank working alone
---------------------
check:

Multiply both sides by

OK
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