Physical quantities are measured as 'nu' where n is the magnitude and u is the unit. For example: A boy measured the length of a room as 3 m. Here 3 is the magnitude and m (metre) is the unit. 3 m can also be written as 300 cm.
No. The only European units I know of who were able to sustain that. kind of speed on foot were Foreign Legion-where the standard was 50. km per day. Other infantry units usually come in under 20 miles a day. (and closer to 12-15 miles per day).
No, according to [1], which is referenced by Wikipedia, the leader travels at 61 km/s and the return stroke at 27800 km/s. These speeds are much less than the speed of light (299792 km/s). This is because the leader moves in steps of several tens on metres in less than a microsecond (Î¼s), but these steps have an interval of the order of 50 Î¼s.