During an air-conditioning process, 900 ft3/min of conditioned air at 65F and 30 percent relative humidity is

Question:

During an air-conditioning process, 900 ft3/min of conditioned air at 65°F and 30 percent relative humidity is mixed adiabatically with 300 ft3/min of outside air at 80°F and 90 percent relative humidity at a pressure of 1 atm. Determine
(a) The temperature,
(b) The specific humidity, and
(c) The relative humidity of the mixture.