Air at 80 kPa, 27C, and 220 m/s enters a diffuser at a rate of 2.5 kg/s

Question:

Air at 80 kPa, 27°C, and 220 m/s enters a diffuser at a rate of 2.5 kg/s and leaves at 42°C. The exit area of the diffuser is 400 cm2. The air is estimated to lose heat at a rate of 18kJ/s during this process. Determine
(a) The exit velocity and
(b) The exit pressure of the air. Answers: (a) 62.0 m/s, (b) 91.1 kPa