Definition: speed (velocity) = path / time ; v = d / t; d = distance, t = time

The SI unit of speed is meter per second (m/s). Another unit is kilometer per hour
Fill in the appropriate line the known velocity (speed) value

A furlong is of course defined as 40 rods, a rod being an equally obscure unit
of length measuring 16.5 feet. Thus you can also express a furlong as 220 yards,
660 feet, 201.2 meters, or 1/8 of a mile. (The only people who normally work with
furlongs are those who design race tracks for horses—clearly, an animal whose
height is measured in hands needs a special term to describe how far it runs.)
A fortnight is 14 days (or nights, as the case may be). So something moving at
the speed of one furlong per fortnight (f/f) would be moving very slowly indeed.
Interestingly enough, though, 1 f/f is almost exactly equal to 1 centimeter per
minute; therefore, furlongs per fortnight would be a good unit of measurement for
a snail’s pace, which ranges from a bit less than 1 f/f to about 30.5 f/f.