The rate law for a reaction with reactant A and reactant B is analyzed. It is determined that the reaction is first order in A and second order in B. In one experiment, the rate of the reaction is 3.31 Ms-1, the concentration of A is 0.545 M and the concentration of B is 0.157 M. What is the magnitude of the rate constant k in the rate law (magnitude just means the number without any units)? Enter your answer with at least 3 sig figs.