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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.
Within "business or residential" districts, exceeding the speed limit by more than 20 miles per hour (32 km/h) is considered criminal. Within "urbanized areas", 55 miles per hour (89 km/h) speed limit citations are given for "waste of a finite resource". This exception only applies within a 10-mile-per-hour (16 km/h) threshold.
1.15078 miles per hour (approximately), ... (36 000 ft), an indicated airspeed of 300 kn may correspond to a true airspeed of 500 kn in standard conditions.
30 mph (48 km/h) N/A: No limit [71] N/A: 5 mph (8 km/h) United States [fn 16] 25–35 miles per hour (40–56 km/h) (Varies by State) 55–85 miles per hour (89–137 km/h) [fn 19] [fn 20] 40–65 miles per hour (64–105 km/h) [fn 21] Restrictions only in some states, typically 5–15 mph lower. None formally, though jurisdiction-dependent ...
For less than a second, the researchers calculated wind speeds of more than 300 mph in a portion of the tornado. “This was a violent day in Iowa,” said Tim Marshall, a veteran storm chaser ...
Prior to 2009, a speed limit could be defined in kilometers per hour (km/h) as well as miles per hour (mph). The 2003 version of the MUTCD stated that "speed limits shown shall be in multiples of 10 km/h or 5 mph." [ 118 ] If a speed limit sign indicated km/h, the number was circumscribed and "km/h" was written below.
The 300 SL was capable of reaching speeds of up to 260 km/h (162 mph), earning it a reputation as a sports car racing champion and making it the fastest production car of its time. The car's iconic gullwing doors and innovative lightweight tubular-frame construction contributed to its status as a groundbreaking and highly influential automobile.
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).