Kilometres per hour (km/h or km·h−1) is a unit of measurement for speed or velocity.
Definition
changeBy definition, an object travelling at a speed of one km/h in a straight line for one hour moves one kilometre. The unit is the most commonly used unit of speed worldwide, more common than the SI unit of speed, metres per second (m/s or ms-1).
Kilometres per hour (km/h)
Miles per hour (mph)
Both
No speed limit units