Oxygen enters a diffuser steadily at 180 kPa and 320 m/s with a mass flow rate of 800 kg/hr and leaves at 1.2 MPa and 300 degrees Celsius. The exit area of the diffuser is 75 cm2 and heat is lost to the surroundings at a rate of 6 kW. Determine (a) the exit velocity and (b) the inlet temperature. (Use the properties of Oxygen at 300K)