A room has a volume of 128 m3. An air-conditioning system is to replace the air in this room every twenty-three minutes, using ducts that have a square cross section. Assuming that air can be treated as an incompressible fluid, find the length of a side of the square if the air speed within the ducts is the following.
(a) 3.1 m/s.
(b) 4.8 m/s