Working together, two pumps can drain a certain pool in 6 hours. If it takes the older pump 15 hours to drain the pool by

Question

Working together, two pumps can drain a certain pool in 6 hours. If it takes the older pump 15 hours to drain the pool by itself, how long will it take the newer pump to drain the pool on its own? 
Do not do any rounding.

Kunduz · Accepted Answer

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