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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.
A value of 9.460 536 207 × 10 15 m found in some modern sources [15] [16] is the product of a mean Gregorian year (365.2425 days or 31 556 952 s) and the defined speed of light (299 792 458 m/s). Another value, 9.460 528 405 × 10 15 m, [17] is the product of the J1900.0 mean tropical year and the defined speed of light.
The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).
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.
Point system may lead to license suspension. Exceeding the speed limit by more than 15 mph (24 km/h) with a speed of greater than 55 mph (89 km/h) or travelling faster than 80 mph (129 km/h) results in a minimum 30-day license suspension. [67] Pennsylvania: $35 [68] plus court and other costs. All fines doubled in active work zones. Absolute
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The time converts to an average speed of 112.5 mph (181.1 km/h). Despite these successes, however, Class 91 locomotives have never used their 140 mph top speed in regular service, because testing conducted by British Rail in 1988 established that drivers could not interpret and act upon line-side signal aspects with sufficient consistency and ...