This is awesome!! just what i needed

I just have one more question regarding the SIR model, out of topic although.

I need to find the value of t were the curve of i(t) is peaking, and the value of i at this point.

Usually i would solve it like this: solve(i´(t)=0,t) , but i have no idea what to do when it is a system of differential equations.

The solution is probably very easy, but i hope you can help me with this??

Sir_model.mw