please help me with this question and all the steps n assumptions

Figure 3: Schematic representation of a venturi meter [10 Marks] QUESTION 4 An enhanced-oil-recovery operation system; transports gaseous methane and oil through a horizontal carbon steel pipeline with an internal diameter of 20cm at flow rates 0.335 m3/s and 0.0101m3/s, respectively. The material safety data sheet provides the following physical properties methane=0.756kg/m3 and oil=850kg/m3;methane=1.05105 kg/ms and oil=8.95104kg/ms. If the friction factor is 0.0180 , what is the pressure gradient across the pipeline