Steam at 160 bar, 480°C, enters a two-stage turbine operating at steady sate with a volumetric flow rate of 800 m3/min. Eighteen percent of the entering mass flow exits at the first stage. The rest exits at the second stage with a pressure of 0.06 bar, a quality of 94%, and a velocity of 400 m/s. Determine the diameter of the exit duct at the second stage, in m.