An aquarium tank can hold 6600 liters of water. There are two pipes that can be used to fill the tank. The first pipe alone can fill the tank in 66 minutes. The

second pipe can fill the tank in 55 minutes by itself. When both pipes are working together, how long does it take them to fill the tank?

U minutes

X

5

?

Question

Mathematics

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29 December, 07:35

An aquarium tank can hold 6600 liters of water. There are two pipes that can be used to fill the tank. The first pipe alone can fill the tank in 66 minutes. The

second pipe can fill the tank in 55 minutes by itself. When both pipes are working together, how long does it take them to fill the tank?

U minutes

X

5

?

+5

Answers (1)

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Alyssa Dalton · Answer 1

The first pipe operates at rate of (6600 L / 66 min) = 100 L/min.

The second pipe operates at a rate of (6600 L / 55 min) = 120 L/min.

Working together, both pipes operate at a total rate of 220 L/min.

Then the time it takes for both of them to fill the tank is

(6600 L) * (1/220 min/L) = 30 min