Does the software store unit information and calculates with units (like say 1 m / 1 s = 1 m/s) or does it directly operate on the numerical value (so just 1/1

Does the software store unit information and calculates with units (like say 1 m / 1 s = 1 m/s) or does it directly operate on the numerical value (so just 1/1 = 1)? I think the first way should be fast enough with today's processors (but IIRC the processors on the Rovers are slower).