Right. The denominator in rate is per "unit of time" and we dont know the period. The two ways you could compare them are equal points on a bell curve, or equ

Right. The denominator in rate is per "unit of time" and we dont know the period. The two ways you could compare them are equal points on a bell curve, or equal time periods. What you can't do is compare two instantaneous speeds and then argue that one car has a faster average speed.