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1 km/h = 3.6 m/s... but do you drive too fast in the US if you drive 87 miles per hour? And 177 kilometers per hour? How fast might that be in miles per hour? Here you have answers to those questions and to some more. Plus, a brief history in a nutshell of kilometers per hour and miles per hour! 

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Roots of kilometer are in France when the French Academy of Sciences developed a new measurement system in 1793. French "millaire" was 10000 meter. In 1867 Holland started to use the term "kilometer" to represent 1000 metres. As well in 1860's "kilometers per hour" came to use in the England and US. In 1975 a European Union directive required the use of the km/h abbreviation on all speedometers on cars sold within the EU. 

Table of conversion from different units, mph to kmh, from 01 mph to 125 mph
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Mile has a rich history. Roman Mile 'mille passus', 29 BC was a lenght of the total distance of the left foot hitting the ground 1,000 times!

The Old English Mile from the Mediavel times was 2,1km. The Mile (1609m) as we know it today was established 1959 by US, UK, Canada, Australia, New Zealand, and South Africa.

Miles per hour first came into common usage with the regular stage coaches. In the early 19th century the railroads speeds became significantly higher, though at one time many people thought that all the passengers would asphyxiate if the trains went at over 20 mph.


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