One kilometer is one million times longer than millimeter.The simple answer to this simple question is,simply :- 1 kilometer.
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1 kilometer = 1000000 millimeter
Kilometer is the longest 1 kilometer is 1 million millimeter
Kilometer - km (1000m) Millimeter - mm (.001m) 1km = 1 000 000 mm
kilometer
Millimeter centimeter meter kilometer is the right order