Mathematics, 22.07.2019 12:00 gggggg388

An aquarium tank can hold 6000 liters of water. there are two pipes that can be used to fill the tank. the first pipe alone can fill the tank in 40 minutes. the second pipe can fill the tank in 60 minutes by itself. when both pipes are working together, how long does it take them to fill the tank?

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An aquarium tank can hold 6000 liters of water. there are two pipes that can be used to fill the tan...