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How fast is 702 miles per hour?

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It's about nine-tenths as fast as The Speed of Sound.
In other words, 702 miles per hour is 0.9150 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 1.09 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 767 miles per hour. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 3,350 miles per hour to 3,490 miles per hour in water, depending on its salinity.
It's about four-fifths as fast as a Bullet (Handgun).
In other words, 702 miles per hour is 0.8170 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 1.220 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 857 miles per hour. 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, 702 miles per hour is 0.470 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 2.10 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 1,500 miles per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about three times as fast as a Peregrine Falcon.
In other words, 702 miles per hour is 2.910 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.3440 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 242 miles per hour 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 one-third as fast as a Bullet (Rifle).
In other words, 702 miles per hour is 0.3430 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 2.920 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 2,050 miles per hour. 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 The CRH (train).
In other words, 702 miles per hour is 3.20 times the speed of The CRH (train), and the speed of The CRH (train) is 0.310 times that amount.
(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 220 miles per hour. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about three-and-a-half times as fast as a Porsche 911.
In other words, 702 miles per hour is 3.430 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.2920 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 204 miles per hour. It takes just 7.4 seconds for the GT2 to accelerate to 100 mph.