Air is heated as it flows through a 75-mm-diameter pipe at a rate of 0.045 kg/s. At station 1, the air has an average velocity of 5.5 m/s and a temperature of 311 K. Downstream, at station 2, the air has a temperature of 389 K and a pressure of 130 kPa. Determine 

(a) The average velocity (m/s) at section 2 

(b) The pressure (kPa) at station 1.