Hello, I am able to identify the intermediates but I am having trouble figuring out what to do with the constants, my book only shows how to get the overall reaction by the reaction below.

(c) Calculate the rate of formation of B at t = 30 min. 7. The following 3-step mechanism has been proposed for the reaction of chlorine and chloroform: C1, (8) 72Cl(g) CI(g)+CHCI (g)-* HCl(9)+CCI,(9) CH(g)+CCI (8) CCI.(8) The numerical values of the rate constants for these steps are ki=4.8x10: k1=3.6x10'; k3=1.3x102; kz=2.7x102. Derive the rate law and the magnitude of the effective rate constant for the overall reaction