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

Question:

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