In this formula, Time at Maximum Intermediate Concentration uses Rate Constant for First Step First Order Reaction, Initial Reactant Concentration for Multiple Rxns & Rate Constant for Zero Order Rxn for Multiple Rxns. We can use 2 other way(s) to calculate the same, which is/are as follows -
Time at Maximum Intermediate Concentration = ln(Rate Constant for Second Step First Order Reaction/Rate Constant for First Step First Order Reaction)/(Rate Constant for Second Step First Order Reaction-Rate Constant for First Step First Order Reaction)
Time at Maximum Intermediate Concentration = 1/sqrt(Rate Constant for First Step First Order Reaction*Rate Constant for Second Step First Order Reaction)