"It is just as far."
Translation:Det er lige så langt.
As bearghest explained in his post - https://forum.duolingo.com/comment/34675956/Bare-vs-Kun
Lige, means Just as you. In order to express the similiarities between two objects or persons. Kun, is usually used in terms of "Only", There were Only / Just two cakes. The danes use Kun usually in numbers. Bare, is used to express, for instance, I "just" like that.
Note, that in negative sentences you should not use Kun, but Bare.