Natural gas essentially pure methane is being pumped

Question

Problem - Natural gas, essentially pure methane is being pumped through a 1.016 m ID pipeline at a rate of 41.00 kg/s m². Assuming the flow is isothermal at 288.8 K, and the inlet pressure p₁ = 683.5 x 10³ Pa and the exit pressure is p₂ = 170.3 x 10³ Pa. Calculate the maximum velocity that can be obtained if p₂ is lowered.