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Running is often measured in terms of pace, [54] expressed in units of minutes per mile or minutes per kilometer (the inverse of speed, in mph or km/h). Some coaches advocate training at a combination of specific paces related to one's fitness to stimulate various physiological improvements.
Since 2019 runners over the age of 20 qualify when they are able to complete an officially recognised marathon (42.2 km) in under 4:50 (5 hours before 2019). [8] During the event an athlete must also reach five cut-off points in specified times to complete the race. [ 1 ]
For a performance to be ratified as a world record by World Athletics, the marathon course on which the performance occurred must be 42.195 km (26.219 mi) long, [34] measured in a defined manner using the calibrated bicycle method [35] (the distance in kilometers being the official distance; the distance in miles is an approximation) and meet other criteria that rule out artificially fast ...
The population density was 1,720.0 inhabitants per square mile (664.1/km 2). There were 46,758 housing units at an average density of 741.2 per square mile (286.2/km 2 ). The racial makeup of the city was 79.0% White , 11.3% African American , 0.3% Native American , 5.2% Asian , 0.1% Pacific Islander , 1.1% from other races , and 3.1% from two ...
The population density was 1,755 people per square mile (678 people/km 2). There were 583,646 housing units at an average density of 799 per square mile (308/km 2). The racial makeup of the county was 84.33% White, 12.41% Black or African American, 0.12% Native American, 1.69% Asian, 0.03% Pacific Islander, 0.34% from other races, and 1.07% ...
In 1871, the Great Chicago Fire destroyed an area about 4 miles (6.4 km) long and 1-mile (1.6 km) wide, a large section of the city at the time. [46] [47] [48] Much of the city, including railroads and stockyards, survived intact, [49] and from the ruins of the previous wooden structures arose more modern constructions of steel and stone. These ...
At 505,992 km 2 (195,365 sq mi), Spain is the world's fifty-first largest country and Europe's fourth largest country. It is some 47,000 km 2 (18,000 sq mi) smaller than France. At 3,715 m (12,188 ft), Mount Teide ( Tenerife ) is the highest mountain peak in Spain and is the third largest volcano in the world from its base.
About 158.27 miles (254.71 km) of shoreline are on Tampa Bay. The county's unincorporated area is around 888 square miles (2,300 km 2), more than 84% of the total land area. Municipalities account for 163 square miles (420 km 2). The modern boundaries of the county place it midway along the west coast of Florida. [citation needed]