In a mine between upcast shaft and downcast shaft, two airways are connected in parallel and their resistances are 100 and 120 Ns^-2m^-8 respectively. The resistance of upcast shaft, downcast shaft and the fan drifts are 10, 20, and 5 Ns^-2m^-8 respectively. The fan drift air pressure is 15 MN/m². The rate of airflow through the mine in m³

A. 4.16

B. 18.26

C. 240.35

D. 333.33

E. 490.56

Answer: Option E