abbr.(书写形式)千米，公里

I walked for an hour and covered about 5 km.
我走了一个小时，大约走了5公里。
The marathon route is exactly 42.195 km long.
马拉松路线全长正好是42.195公里。
The distance from my house to the office is 10 km.
从我家到办公室的距离是10公里。
We need to drive 200 km to reach the nearest airport.
我们需要开200公里才能到达最近的机场。
The high-speed train can travel at a speed of 300 km per hour.
高速列车的时速可达300公里。
The new highway will reduce the journey time by 50 km.
新的高速公路将使旅程时间减少50公里。
The hiking trail extends over a distance of 15 km.
这条徒步旅行路线长达15公里。
The car's fuel efficiency is around 10 km per liter.
这辆车的燃油效率大约是每升油可以行驶10公里。
The flight from Beijing to Shanghai is approximately 1,000 km.
从北京飞往上海的航程大约是1,000公里。
She completed the cycling race in just under 3 hours, covering a total of 80 km.
她在不到3小时内完成了全程80公里的自行车比赛。