Natural gas consisting essentially of methane is to be transported through a 20-in.-ID pipeline over flat terrain. Each pumping station increases the pressure to 100 lb_ƒ/in.² abs, and the pressure drops to 25 lb_ƒ/in.² abs at the inlet to the next pumping station 50 mi away. What is the gas flow rate in cubic feet per hour measured at 60°F and 30 in. Hg pressure?