In a mine ventilation system the resistances of two splits A...

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In a mine ventilation system, the resistances of two splits A and B are 0.5 Ns²m^-8 and 2 Ns²m^-8 respectively. Combined resistance of two shafts and trunk airways is 0.7 Ns²m^-8. A quantity of 20 m³/s of air passes through split A. The total air quantity passing the mine in m³/s is

A. 30

B. 27

C. 25

D. 17

Answer: Option A

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