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Re:Ask HN: Do you know any useful "Back of the Envelope Calc... by zalew on Saturday September 18, 2010 @09:28AM (#1704150)
kilometer is km not ks. just sayin'
Re:Ask HN: Do you know any useful "Back of the Envelope Calc... by nailer on Saturday September 18, 2010 @11:11AM (#1704299)
One is an abbreviation. The other is a coloquial term, pronounced 'kays' used in most western speaking metric countries.