Speed. Time. Distance

Three quantities describe uniform motion: distance

s

, time

t

, and speed

v

(how many units of distance per unit of time). The relationship is the same as “price — quantity — total,” only the names and units change:

s = v \cdot t

v = s \div t

t = s \div v

Speed is often measured in km/h (kilometers per hour), time in h or min, distance in km. Before you calculate, make sure the units match (for example, hours with km/h, not minutes without converting).

s=v\cdot t

— distance at constant speed

Speed is “how much distance per unit of time”

v=s\div t

and

t=s\div v

— same formula rearranged

Watch the units: km/h, h, km

Distance: s = v·t

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