An air-conditioning system is designed to fill a room of 10 m $\times$ 8 m $\times$ 6 m with fresh air every 20 minutes.If the circular air duct has a diameter of 13 cm,calculate the speed of airflow in the duct.
A)None of the answers below
B)450 m/s
C)2.4 m/s
D)7.5 m/s
E)1.0 m/s

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The Answer of An air-conditioning system is designed to fill a room of 10 m $\times$ 8 m $\times$ 6 m with fresh air every 20 minutes.If the circular air duct has a diameter of 13 cm,calculate the speed of airflow in the duct.
A)None of the answers below
B)450 m/s
C)2.4 m/s
D)7.5 m/s
E)1.0 m/s

An Air-Conditioning System Is Designed to Fill a Room of 10