km means kilometer, and the prefix "kilo" means 1000. Perhaps you can work it out from there.
120 feet = about 36.6 meters.
A km (kilometer) is larger than a meter. Their are 1000 meters in one kilometer.
A Km is 1000 metres. The prefix Kilo, means 1000x whatever the base unit is.
2.6 kilometers = 2600 meters