Air enters a circular conduit at a pressure of 105 kPaa and leaves at an outlet pressure of 108 kPaa. The outlet is at a higher level than the inlet with a difference of elevation of 15 m. The cross-sectional diameter at the inlet is 50 cm, while at the outlet is at 85 cm. Calculate the volume flow rate of air in CMH. Take the density of air as 1.2 kgm/m3.