When three pipes fill a pool, they can finish in 12 hours. Two of the pipes can finish in 18 hours if they are working together.
How long would it take a third pipe to fill the pool on its own?
1 answer:
The number of pipes * the time is a constant proportional to the pool size.
3*12 = 2*18 = 1*36. So one pipe would take 36 hours.
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