Dry air enters an industrial dryer with a pressure of 101 kPa, a temperature of 250*C, and a mass flow rate of 2.6kg/hr through a duct with a cross-sectional area of 0.85m^2. A wet material is placed inside the dryer, and its rate of drying is 5.5g/min. Determine the mass flow rate of gases leaving the dryer and the average velocity of air entering the dryer, assuming steady operation.