Pumps A and B

Pump A fills the tank for 12 minutes, and pump B for 24 minutes. How long will it take to fill the tank if he is only three minutes work A and then both pumps A and B?

Correct answer:

x =  9 min

Step-by-step explanation:


1/12 x + 1/24 (x-3) = 1

1/12·x + 1/24·(x-3) = 1

3x = 27


x = 27/3 = 9

x = 9

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