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How fast is 854 kilometers per hour?

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It's about two-and-a-half times as fast as The TGV (train)
In other words, 854 kilometers per hour is 2.7 times the speed of The TGV (train), and the speed of The TGV (train) is 0.37 times that amount.
(Train à Grande Vitesse) (for SNCF TGV Réseau, a.k.a. "Network" model, a.k.a. TGV-R) (maximum speed)
The TGV Réseau sets have a top speed of 320 kph. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.
It's about one-third as fast as a Jet Fighter
In other words, 854 kilometers per hour is 0.35 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 2.9 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 2,400 kilometers 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 Helicopter
In other words, 854 kilometers per hour is 3.0 times the speed of a Helicopter, and the speed of a Helicopter is 0.332 times that amount.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 284 kph. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
It's about three-and-a-half times as fast as a Skydiver (headfirst)
In other words, 854 kilometers per hour is 3.3 times the speed of a Skydiver (headfirst), and the speed of a Skydiver (headfirst) is 0.3 times that amount.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 260 kph. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about one-fourth as fast as a Bullet (Rifle)
In other words, 854 kilometers per hour is 0.259 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 3.86 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 four-and-a-half times as fast as a Tornado
In other words, 854 kilometers per hour is 4.296769 times the speed of a Tornado, and the speed of a Tornado is 0.232733 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 177.02784 kph and 220.480128 kph. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about four-and-a-half times as fast as a Skydiver (belly-to-earth)
In other words, 854 kilometers per hour is 4.5 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 0.22 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 190 kph. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.