A main fan of a mine circulates 40 m3 s of...

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A main fan of a mine circulates 40 m³/s of air at a pressure of 500 Pa. the mine has two splits of equal resistance. The trunk airways have a total resistance of 0.2 Ns²/m⁸. When a booster fan is installed in one split, the flow of air in the other splits stops. Assuming that the pressure remains unchanged, the new air quantity flowing through the mine in m³/s is

A. 20

B. 30

C. 40

D. 50

Answer: Option D

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