SOLUTION: 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 50 minutes. The second pipe can fi

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Question 414532: 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 50 minutes. The second pipe can fill the tank in 75 minutes by itself. When both pipes are working together, how long does it take them to fill the tank?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Filling the tank is one job
One pipe fills in 50 minutes
It does 1/50 of the job in 1 minute
other pipe 70 minutes
It does 1/70 of thejob in 1 minute

Together they will do 3/88 of the job in one minute
So they will take 29 1/6 minutes
So they will take 29.17 minutes