Refrigerant-134a at 700 kPa and 120 ∘C

Refrigerant-134a at 700 kPa and 120 ∘C enters an adiabatic nozzle steadily with a velocity of 20 m/s and leaves at 400 kPa and 30∘∘C. Determine

(a) the exit velocity and
(b) the ratio of the inlet to exit area A1/A2.