College

The return-air ventilation duct in a home has a cross-sectional area of 900 cm\(^2\). The air in a room with dimensions 7.0 m × 11.0 m × 2.4 m is to be completely circulated in a 40-minute cycle.

What is the speed of the air in the duct?

Express your answer to two significant figures in meters per second (m/s).