Compound B is very important to your research project. In order to synthesize it, you initiate a reaction with the following mechanism: 

A→B→C 

where the rate constant for the first step, k1, is 2.22 ms ^-1 and the rate constant for the second step, k2, is 1.69 ms ^-1 (note the units for k1 and k2). Assuming that you only start with compound A in the system, at what time will you stop the reaction and extract compound B in order to maximize the amount of B in the system? Express your answer in seconds to three significant digits (X.XXEX).