# Two pumps together

The first pump will fill the tank itself in 3 hours and the second one in 6 hours. How many hours will the tank be full if both pumps are worked at the same time?

Result

t =  2 h

#### Solution:

$t = \dfrac{ 1 }{ 1/3+1/6 } = 2 = 2 \ \text{ h }$

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