Answer:
1000:1
Explanation:
We know that,
1 kilometer = 1000 meter
If we want to find the ratio between two factors i.e. kilometer and meter, let it is equal to R.
So,
[tex]R=\dfrac{1\ km}{1\ m}\\\\=\dfrac{1000\ m}{1\ m}\\\\R=\dfrac{1000}{1}[/tex]
So, the ratio is 1000:1.