MILE and KILOMETRE PER HOUR SPEEDS

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Miles per hour is a unit of speed, expressing the number of international miles covered per hour. The common abbreviation in everyday use is mph, although mi/h, using the SI method of expressing derived units, is sometimes used, especially in the United States. The preferred SI unit for velocity is m/s, although km/h is often used as a replacement for mph.

When calculating how fast - this will help

1 mph is equal to:

• 0.44704 m/s, the SI derived unit

• 1.609344 km/h

• 22/15 =1.4667 feet per second

• approx. 0.868976 knots

Miles per hour is the unit used for speed limits on roads in the US and Britain.

## Examples of speeds in mph

 3 mph Walking speed 15 mph Bicycling speed 23 mph Top speed of a running human. (34 ft/s) 30 mph Residential speed limit Top speed of a running cat, or dog 50–60 mph Speed limit on a major road Top speed of an antelope 70 mph Highway or motorway speed Top speed of a cheetah 180 mph High-speed train 625 mph Airliner cruising speed 761 mph The approximate speed of sound (at sea level) 763 mph Current world land speed record 16,250 mph Re-entry speed of a space shuttle 25,200 mph Earth's escape velocity 670,616,629 mph Speed of light

Kilometre per hour (American spelling: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The correct SI symbol is km/h or km·h−1, although the unit is sometimes written colloquially as kph, kmph, or km/hr. None of these corruptions is correct under the rules of SI in reference to correct style when using symbols. It is often spoken and sometimes written as klicks or kays in slang usage.

By definition, an object travelling at a speed of 1 km/h for an hour would move 1 kilometre.

• 3.6 km/h ≡ 1 m·s−1, the SI derived unit of speed, metre per second

• 1 km/h ≈ 0.27778 m/s

• 1 km/h ≈ 0.62137 mph ≈ 0.91134 foot per second

## Examples of speeds in km/h

 5 km/h Walking speed 20 km/h Easy bicycling speed 36 km/h Top speed of a running human. (100 m in 10 seconds) 50 km/h Residential speed limit Top speed of a running cat, or dog 80–90 km/h Speed limit on a major road Top speed of an antelope 100–120 km/h Highway or motorway speed Top speed of a cheetah 300 km/h High-speed train 1,000 km/h Airliner cruising speed 1,200 km/h The approximate speed of sound (at sea level) 1,228 km/h Current world land speed record 26,000 km/h Re-entry speed of the space shuttle 40,320 km/h Earth's escape velocity 1,079,252,848.8 km/h Speed of light (exact)