Translation of "Kilometres" in Chinese

My city is fifty kilometres from the capital.

我的城市离首都五十千米。

- I walked 10 kilometers today.
- I walked 10 kilometres today.

- 今天我走了10公里。
- 今儿我走了10公里路。

My final destination in China is the city of Harbin in the north-east, about one thousand kilometres from Beijing.

我在中国最后的目的地是东北的哈尔滨，离北京大概一千公里左右。

I still remember the first time I was in China; I was in Shandong, and I realised that that province alone is twenty six thousand square kilometres bigger than England.

我还记得我第一次去中国，我在山东，意识到那个单纯的省比英格兰大两万六千平方公里。