If you have one its located behind the emergecy brake under a "flip up" lid, along with the ashtry.

Coolant is added to a mini cooper in the equalizing tank. Some models have a flip up lid, while others have a screw on lid.

Flip back the front passenger seat and open the compartment lid

Take an empty film canister and fill it with baking soda and vinegar. make sure to be quick with putting the lid back on it. once lid is on flip it over and stand back.

The JK flip-flop is not better than an RS flip-flop...it's just different. The selection of one or the other depends on what you are trying to do in your digital circuit design.