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How fast is 45 miles per second?

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It's about 750 times as fast as The CRH (train)
In other words, the speed of The CRH (train) is 0.0013 times 45 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 650 times as fast as a Peregrine Falcon
In other words, 45 miles per second is 671 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.00149 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 200 times as fast as The Speed of Sound
In other words, 45 miles per second is 211 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.00474 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 200 times as fast as a Bullet (Handgun)
In other words, 45 miles per second is 189 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 0.00529 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 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 100 times as fast as a Jet Fighter
In other words, 45 miles per second is 110 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 0.0091 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 0.420 miles per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about 80 times as fast as a Bullet (Rifle)
In other words, 45 miles per second is 79.10 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 0.0126 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 nine-and-a-half times as fast as The Space Shuttle
In other words, 45 miles per second is 9.35230 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 0.106930 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 4.81170 miles per second. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.