Air at 15 8C and a relative humidity of 70% enters a mixing chamber at a flow

Question:

Air at 15 8C and a relative humidity of 70% enters a mixing chamber at a flow rate of 80m3/min. Another flow of air at 40 8C and a relative humidity of 30% enters at a flow rate of
a) 40m3/min,
b) 60m3/min,
c) 80m3/min. Calculate the temperature, relative humidity, and mass flow rate of the air exiting the mixing chamber. Assume 100 kPa throughout.