Answer: you always want your wheels to be facing the curb, so if your brakes go out or something, your car will roll into the curb.
The bus's position
at time
is

If we take the bus's rear's starting position to be the origin, then the position of the mate (?) is given by

The mate draws level with the rear of the bus when
:

Drop the units to make things simpler:

So it would take 3 seconds for the mate to catch up to the bus.
The Retina is a layer in the back of the eye which contain cells that are sensitive to light and trigger nerve impulses to be received by the brain which causes visual images to be formed