Consider the duct system shown in the accompanying figure. Air flows through two 8-in.-b...

Consider the duct system shown in the accompanying figure. Air flows through two 8-in.-by-10-in. ducts that merge into a 18-in.-by-14-in. duct. The average speed of the air in each of the 8 × 10 ducts is 30 ft /s. What is the volume flow rate of air in the 18 × 14 duct? Express the volume flow rate in ft³/s, ft³/min, and m³/s. What is the average speed of air in the 18 × 14 duct?