# Inflow - outflow

The tank will fill by inflow for 143 minutes and empties by outflow for 150 minutes.

How long take to fill tank if it is also opened the inflow and outflow?

Result

x =  3064.29 min

#### Solution:

$\dfrac{1}{x} = \dfrac{1}{ 143 } - \dfrac{1}{ 150 } \ \\ x = \dfrac{1}{ \dfrac{1}{ 143 } - \dfrac{1}{ 150 } } \ \\ x = 3064.29 \ \text{min}$

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