A12 cm radius air duct is used to replenish the air of a room 9.2 m x 5.5 m x 4.5 m every 10 min. how fast does the air flow in the duct?

In this problem, given the dimensionns of the room and the dimension of the pipe in which air passes through, we can determine the flow of air in the duct. The area of the duct is A = pi r2 where r is equal to 12 cm. we divide this area to time which is 10 minutes, then we get the answer.

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