Kilometre and meter both are the units which is used to determine the length.
Kilometre and meter both are the metric measurement and abbreviated as km and m. Conversion of km into m include the multiplication of length with the conversion ratio. 1 km is equal to 1000 m. Thus, by multiplying with 1000, given length in km can be converted to m.
Since, 1 km = 1000 m.
Then, 12 km = [tex]12\times 1000[/tex] m
= 12000 m.
Hence, 12 km = 12000 m
