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Miles per hour (mph, m.p.h., MPH, or mi/h) is a British imperial and United States customary unit of speed expressing the number of miles travelled in one hour. It is used in the United Kingdom , the United States , and a number of smaller countries, most of which are UK or US territories, or have close historical ties with the UK or US.
1.7–8.3 × 10 −8: Speed of propagation for unmyelinated sensory neurons. 30: 110: 70: 1 × 10 −7: Typical speed of car (freeway); cheetah—fastest of all terrestrial animals; sailfish—fastest fish; speed of go-fast boat. 40: 140: 90: 1.3 × 10 −7: Typical peak speed of a local service train (or intercity on lower standard tracks). 40 ...
kilometre per hour: km/h km/h US spelling: kilometer per hour: 1.0 km/h (0.62 mph) km/h mph; Imperial & US customary: mile per hour: mph mph 1.0 mph (1.6 km/h) mph km/h; mile per second: mi/s mi/s 1.0 mi/s (1.6 km/s) mi/s km/s; foot per second: ft/s (foot/s) ft/s long code "foot/s" outputs foot per second (and never feet) 1.0 ft/s (0.30 m/s) ft ...
Different from instantaneous speed, average speed is defined as the total distance covered divided by the time interval. For example, if a distance of 80 kilometres is driven in 1 hour, the average speed is 80 kilometres per hour. Likewise, if 320 kilometres are travelled in 4 hours, the average speed is also 80 kilometres per hour.
The maximum speed of a Bugatti Chiron (the fastest production road car) is 305 mph. The Mitubishi Mirage (the cheapest car available in the US in 2023) tops out at 105 mph.
In 1901, Connecticut was the first state in the United States to impose a numerical speed limit for motor vehicles, setting the maximum legal speed to 12 mph (19 km/h) in cities and 15 mph (24 km/h) on rural roads. Speed limits then propagated across the United States; by 1930 all but 12 states had established numerical limits. [12]
The Solar System is traveling at an average speed of 230 km/s (828,000 km/h) or 143 mi/s (514,000 mph) within its trajectory around the Galactic Center, [3] a speed at which an object could circumnavigate the Earth's equator in 2 minutes and 54 seconds; that speed corresponds to approximately 1/1300 of the speed of light. The galactic year ...
Highest-posted speed limits around the world. Kilometres per hour are on the left and miles per hour on the right.* A speed limit is the limit of speed allowed by law for road vehicles, usually the maximum speed allowed. Occasionally, there is a minimum speed limit. [1] Advisory speed limits also exist, which are recommended but not mandatory ...