The equilibrium for the reaction Fe3++SCN FeSCN2+ at the temperature of 25C is subjected to a temperature jump that slightly increases the concentrations of Fe3+ and SCN. The measured relaxation time is 3.0 s. The equilibrium constant, K, for the system is 2.0x1016 moldm3 and the equilibrium concentration of Fe3+ and SCN are both [Fe3+]eq = [SCN]eq = 2.0x104 moldm-3 . Calculate the rate constants for the forward and reverse steps, kf and kr respectively.