a train can be a kilometer long. A bridge or road could also be. This question is just too vague.
The house we found to rent is about a kilometer from the college. (A kilometer is 1000 meters long)
A meter is 1/1000 of a kilometer (there are 1,000 meters per kilometer).
5 kilometer long and 2 decemeter wide
One kilometer is 39,370 inches or 3,280.8 feet.
12,2 kilometer long
1 mile = 1.6093 kilometers 1 kilometer = 0.6214 mile