Air enters a diffuser with a velocity of 200 m/s, a static pressure of 80 kPa and

Question:

Air enters a diffuser with a velocity of 200 m/s, a static pressure of 80 kPa and a temperature of 268 K. The velocity leaving the diffuser is 50 m/s and the static pressure at the diffuser exit is 90 kPa. Determine
(a) The total pressure (p) at the exit and
(b) The static temperature (T) at the diffuser exit,
(c) the diffuser efficiency(%).