SOLUTION: One pipe can fill a tank in 8 minutes and a second can fill it in 12 minutes. If the tank is empty, how long will it take both pipes to fill it.

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Question 966882: One pipe can fill a tank in 8 minutes and a second can fill it in 12 minutes. If the tank is empty, how long will it take both pipes to fill it.
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!

The first pipe fills  1%2F8  of the tank volume in  1 minute.

The second pipe fills  1%2F12  of the tank volume in the same time.

Working together,  the two pipes fill  1%2F8 + 1%2F12 = 3%2F24 + 2%2F24 = 5%2F24  of the tank volume in  1 minute.

Hence,  it will take  24%2F5 minutes for both pipes to fill the tank.
It is equal to  44%2F5  minute =  4  minutes and  48  seconds.