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How fast is 0.420 miles per second?

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It's about as fast as a Jet Fighter
(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 0.420 miles per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about three-fourths as fast as a Bullet (Rifle)
In other words, 0.420 miles per second is 0.7390 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 1.350 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 0.5690 miles per second. 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 one-and-three-fourths times as fast as a Bullet (Handgun)
In other words, the speed of a Bullet (Handgun) is 0.5680 times 0.420 miles per second.
(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 0.2380 miles per second. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about twice as fast as The Speed of Sound
In other words, 0.420 miles per second is 1.970 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.5080 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 0.2130 miles per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 0.930 miles per second to 0.9690 miles per second in water, depending on its salinity.
It's about six-and-a-half times as fast as a Peregrine Falcon
In other words, 0.420 miles per second is 6.260 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.160 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.0671 miles per second 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 seven times as fast as The CRH (train)
In other words, the speed of The CRH (train) is 0.140 times 0.420 miles per second.
(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 0.06 miles per second. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about seven-and-a-half times as fast as a Porsche 911
In other words, the speed of a Porsche 911 is 0.1350 times 0.420 miles per second.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 0.0568 miles per second. It takes just 7.4 seconds for the GT2 to accelerate to 0.0278 miles per second.