Consider the duct system shown in the accompanying figure. Air flows through two 8- in.-by-10-in. ducts that merge into a 18-inch-by-14-inch duct. The average speed of the air in each of the 8 x 10 duct is 30 ft/s. What is the volume flow rate of air in the 18 × 14 duct? Express the volume flow rate in ft^3/s, ft^3/min, and m3/s. What is the average speed of air in the 18 ×14 duct?
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