Help me to solve the problem below. appreciate it

A packed bed reactor is filled with catalyst material with a diameter of 2.6mm. The length of the reactor is 60cm and the catalyst has a porosity of 0.4 . The superficial mass velocity of the inlet gas is 12kg/m2s with a viscosity of 1.55105kg/ms and a density of 2.5kg/m3. The inlet pressure is 750 kPa. Find the pressure, P, at the end (the exit) of the PBR. Express your answer in kPa to the integer place, e.g. 997.5754 would be 998 . Assume =0