The distance between places.
A kilometre is quite a long unit of measurement. For this reason you would use it to measure large things on earth. For example: The distance between cities The length of a coastline How far a train...
a) the flying height of an aircraftb) the length of a canalc) laps around a running track
use a odometer in your car =]
Kilometres are comparable to Miles. You can measure long distances such as the distance between two cities, etc. 1 kilometre equals 0,62 miles.
Speed and distance.
How to Take Proper Measurements
How to Measure Length in Nonstandard Measures
Why You Need a Tape Measure When Laying Tiles
How to Add and Subtract Measures of Time