SOLUTION: If tom can fill a swimming pool in 30 min, sally can fill one in 45 min, and Joe can fill one in 90 min. How long will it take for them to fill a swimming pol together?

Question 151235: If tom can fill a swimming pool in 30 min, sally can fill one in 45 min, and Joe can fill one in 90 min. How long will it take for them to fill a swimming pol together?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
If tom can fill a swimming pool in 30 min, sally can fill one in 45 min, and Joe can fill one in 90 min. How long will it take for them to fill a swimming pol together?
;
Let t = time required if they work together
Let the full pool = 1
:
+ + = 1
Multiplying the equation by 90 will get rid of the denominators, results:
:
3t + 2t + t = 90
:
6t = 90
t =
t = 15 min
;
:
Check solution:
+ + =
+ + = 1
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