Respuesta :

The first thing you should know to answer this question is the following conversions:
 1Km = 1000m
 1m = 1000mm
 1Km = 1000000mm
 1m = 100cm
 By making the conversions to the same unit, we can know what measure is greater:
 1.2Km = 1200m
 120600cm = 1206.00m
 1220000mm = 1220m
 120m = 120m
 Answer
 The biggest measure is
 1220000mm = 1220m