6000 km is short for kilometres. Kilo meaning thousand.1000 metres equals 1 kilometretherefore 6 kilometres equals 6000 metres
km means kilometer, and the prefix "kilo" means 1000. Perhaps you can work it out from there.
A Km is 1000 metres. The prefix Kilo, means 1000x whatever the base unit is.
15500 meters
2.6 kilometers = 2600 meters