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How fast is 150 kilometers per hour?

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It's about two-fifths as fast as The CRH (train).
In other words, 150 kilometers per hour is 0.430 times the speed of The CRH (train), and the speed of The CRH (train) is 2.30 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 350 kph. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about two-fifths as fast as a Peregrine Falcon.
In other words, 150 kilometers per hour is 0.3860 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 2.590 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 389 kph 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-tenth as fast as The Speed of Sound.
In other words, 150 kilometers per hour is 0.1210 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 8.260 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 343 m/s. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 5,390 kilometers per hour to 5,620 kilometers per hour in water, depending on its salinity.
It's about one-tenth as fast as a Bullet (Handgun).
In other words, 150 kilometers per hour is 0.1090 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 9.170 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 1,380 kph. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about one-fifteenth as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 16 times 150 kilometers per hour.
(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 nan kilometers per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-twentieth as fast as a Bullet (Rifle).
In other words, 150 kilometers per hour is 0.0455 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 22 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 3,294 kph. 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-two-hundredth as fast as The Space Shuttle.
In other words, 150 kilometers per hour is 0.0053808 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 185.850 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 27,877 kph. 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.