Methane at a flow rate of 5 kg/s enters the pipe with a diameter of 1 m at 293 K and 250 kPa absolute pressure and leaves the pipe at the same temperature at 200 kPa absolute pressure. The f-value of the pipe is 0.002. What is the pipe length? The molar weight of methane is 16. Take R as 8314.34 m Pa/kgmol K.