An aquarium tank can hold 6600 liters of water?
by Aquaboy on Monday, February 15th, 2010 | 2 Comments
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 55 minutes. The second pipe can fill the tank in 66 minutes by itself. When both pipes are working together, how long does it take them to fill the tank?
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The first pipe can put 120 liters of water into the tank a minute (6600/55), and the second pipe can put 100 liters of water a minute (6600/66), which means the tank gets 220 liters a minute.
Therefore, it takes 30 minutes to fill the tank (6600/220).
p1 = 6600/55 = 120 L/min
p2 = 6600/66 = 100 L/min
p1 + p2 = 220 L/min
6600 / 220 = 30 min,