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How fast is 12.8 miles per minute?

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It's about as fast as The Speed of Sound.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 12.8 miles per minute. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 55.8 miles per minute to 58.2 miles per minute in water, depending on its salinity.
It's about nine-tenths as fast as a Bullet (Handgun).
In other words, 12.8 miles per minute is 0.894 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 1.12 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 14.3 miles per minute. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about half as fast as a Jet Fighter.
In other words, 12.8 miles per minute is 0.51 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 2 times that amount.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 25 miles per minute. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about two-fifths as fast as a Bullet (Rifle).
In other words, 12.8 miles per minute is 0.375 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 2.67 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 34.1 miles per minute. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about three times as fast as a Peregrine Falcon.
In other words, 12.8 miles per minute is 3.18 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.314 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 4.03 miles per minute when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about three-and-a-half times as fast as The CRH (train).
In other words, the speed of The CRH (train) is 0.29 times 12.8 miles per minute.
(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 3.6 miles per minute. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about four times as fast as a Porsche 911.
In other words, 12.8 miles per minute is 3.76 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.266 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 3.41 miles per minute. It takes just 7.4 seconds for the GT2 to accelerate to 1.67 miles per minute.