SOLUTION: A new type of pump can train a certain pool in 9 hours. an older pump can drain the pool in 11 hours. how long will it take both pumps working together to drain the pool?
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Question 1144656: A new type of pump can train a certain pool in 9 hours. an older pump can drain the pool in 11 hours. how long will it take both pumps working together to drain the pool? Answer by ikleyn(52776) (Show Source):
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A new type of pump can drain a certain pool in 9 hours. an older pump can drain the pool in 11 hours.
how long will it take both pumps working together to drain the pool?
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The new pump drains of the pool volume in our (in each hour).
The old pump drains of the pool volume in our (in each hour).
Working together, the two pumps drain + = = of the pump volume per hour.
Hence, it will take hours = hours = 4 hours and 57 minutes for two pumps working together to drain the pool.
