please i solved part A

i still have part b

i want the answer very important

3) 38 POINTS Two packed-bed reactors are connected in parallel as shown in the figure below. Packed-bed reactor A is filled with solid particles of density 1600 kg/m'. Particles occupy a length of 1 m in a vessel of cross-sectional area 0.05 m. The mass of solids in the bed is 40 kg and the effective particle diameter is 1 mm. Packed-bed reactor B is filled with solid particles of density 3000 kg/m'. Particles occupy a length of 0.8 m in a vessel of cross-sectional area 0.04 m. The mass of solids in the bed is 60 kg and the effective particle diameter is 0.6 mm. (a) (10 pts) Determine the void fraction of both reactors (b) (28 pts) If the inlet velocity, UA, is 0.01 m/s in Packed Bed A (right at the entrance), determine the inlet velocity, UB, in Packed Bed B (right at the entrance). ? Assume that the fluid phase is mainly water. Assume that the pressure drop in pipes is negligible compared to the pressure drop in packed beds. Packed Bed A x=lm X=0 U. , x=0 Packed Bed B X=0.8 m