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0.44704. 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.
The kilometre per hour (SI symbol: km/h; non-SI abbreviations: kph, km/hr) is a unit of speed, expressing the number of kilometres travelled in one hour. History [ edit ] Although the metre was formally defined in 1799, the term "kilometres per hour" did not come into immediate use – the myriametre ( 10,000 metres ) and myriametre per hour ...
≈ 1 hour walk, Currently defined in US as 3 Statute miles, but historically varied from 2 to 9 km ≈ 4828 m: light-day ≡ 24 light-hours ≡ 2.590 206 837 12 × 10 13 m: light-hour ≡ 60 light-minutes ≡ 1.079 252 8488 × 10 12 m: light-minute ≡ 60 light-seconds ≡ 1.798 754 748 × 10 10 m: light-second
kilometre (km) or kilometer is a metric unit used, outside the US, to measure the length of a journey; the international statute mile (mi) is used in the US; 1 mi = 1.609344 km. nautical mile is rarely used to derive units of transportation quantity.
An input unit can be converted to any number of output units—the outputs are specified as a "combination" by separating unit codes with a space (" ") or a plus (" + "). Using a space as a separator does not work if any of the unit codes contains a space. For example, each of the following converts 1.2 km 2 to acres, square yards, and hectares.
For example, 10 miles per hour can be converted to metres per second by using a sequence of conversion factors as shown below: = . Each conversion factor is chosen based on the relationship between one of the original units and one of the desired units (or some intermediary unit), before being rearranged to create a factor that cancels out the ...
A 1980s-vintage dual miles per hour and kilometers per hour sign, (formerly) located in Florida. Congress included new encouragement for U.S. industrial metrication in the Omnibus Foreign Trade and Competitiveness Act of 1988. This legislation amended the Metric Conversion Act of 1975 and designated the metric system as "the Preferred system of ...
In the United States, speed limits are set by each state or territory. States have also allowed counties and municipalities to enact typically lower limits. Highway speed limits can range from an urban low of 25 mph (40 km/h) to a rural high of 85 mph (137 km/h). Speed limits are typically posted in increments of five miles per hour (8 km/h).