Witch measurement is greater 6km 60m 600cm 6000mm

The size follows like this:
6km> 60m> 600cm = 6000mm 

The reason for this is that 1km = 1000m

and that 100cm is 1m

and 100mm is 1 cm

if you then calculate this:
it would be 6000m vs 60m vs 6m vs 6m :)

6 km is 6000 meters: 1km is 1000 meters (so 6km is bigger than 60 meters)
600cm is 6 meters: 1 meter is 100 cm, so its still smaller than 6 km! (6 m is less than 6 km)

and 6000 mm is equal to 600 cm, which is the same as above

so the correct answer is 6km!