Inflow - outflow

The tank will fill by inflow for 56 minutes and empties by outflow for 77 minutes.

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

Correct answer:

x =  205.33 min

Step-by-step explanation:

t1=56 min t2=77 min  x (t11t21)=1 x1=t11t21  x=1/t11/t21=1/561/771=3616 min=205.33 min

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