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QUESTION
A swimming pool holds 540,000 liters of water. The pool has two drainage pipes.
A swimming pool holds 540,000 liters of water. The pool has two drainage pipes. When the pool is completely full, the first pipe alone can empty it in 120 minutes, and the second pipe alone can empty it in 180 minutes. When both pipes are draining together, how long does it take them to empty the pool?
