km

In a sentence

• Mam do przejechania 50 km do pracy.

  I have 50 km to travel to work.

  In this sentence, 'km' is used as an abbreviation for 'kilometers', a unit of distance.

• Dystans między miastami wynosi 120 km.

  The distance between the cities is 120 km.

  Here, 'km' again refers to 'kilometers', indicating the space between two points.

• Maratończyk przebiegł już 42 km podczas tego biegu.

  The marathon runner has already run 42 km during this race.

  In this example, 'km' describes the length of the path covered in the context of running.