SOLUTION: one pump can fill a tank in 12 minutes while another takes 16 minutes to empty the same tank. How long would it take to fill the tank if both pumps were on?
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Question 454135: one pump can fill a tank in 12 minutes while another takes 16 minutes to empty the same tank. How long would it take to fill the tank if both pumps were on?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If you can fill a tank in 12 minutes, then you can fill 
of the tank in 1 minute. If you can empty a tank in 16 minutes, then you can empty 
of the tank in 1 minute.
If both are working together, then
fills in 1 minute.
Apply the LCD, add the two fractions, and then take the reciprocal to find the time to fill with both pumps going.
John
My calculator said it, I believe it, that settles it
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