83. Solving a chemistry problem

2) The formation of some substance, proceeding according to the equation
A B \u003d AB, is a second-order reaction. The change in the concentration of reagents over time is shown below:
τ, min 0 12 24 42
SA=CB, mol/l 0.01873 0.01794 0.01734 0.01644

Calculate the rate constant and the concentration of AB 1.2 hours after the start of the reaction, if the volume of the system does not change.