This is the 8447th most frequent Korean word.
km
The Korean word "km" (킬로미터) means "kilometer" in English, a unit of distance measurement.
In this sentence, "km" is used as a unit of distance measurement, indicating the distance between two locations.
이 도시는 서울에서 50km 떨어져 있어요.
This city is 50km away from Seoul.
Here "km" is combined with "per hour" to describe speed, relating to the distance covered over time.
우리는 시속 10km로 달리기 훈련을 했습니다.
We trained running at a speed of 10km per hour.
In this instance, "km" represents the speed capability of a futuristic vehicle.