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unit bullet Mach (M)
unit bullet kilometer per hour (km/h)
unit bullet Meter per Second (m/s)
unit bullet Mile per hour (mph)
unit bullet Speed Of light
unit bullet Knot (kn,kt)

Speed

Speed units are usually a combination of two measurement - mainly distance per time, for example: Miles per Hour, Kilometers per Hour, Meters per Second etc.

These units evolved from the basic formulas to calculate speed:

D = S * T

Where:

D= Distance

S= Speed

T = time

if we try to calculate speed (S) we will get:

S = D /T

So , of someone passed 5 miles (D) in 2 hours (T), their speed would be:

5 miles/2 hours = 2.5 miles/hour