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How fast is 911 kilometers per hour?

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It's about three times as fast as The TGV (train).
In other words, 911 kilometers per hour is 2.8 times the speed of The TGV (train), and the speed of The TGV (train) is 0.36 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 three times as fast as an Arrow (archery).
In other words, 911 kilometers per hour is 2.822 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.3544 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 322.8 kph when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
It's about three times as fast as a Helicopter.
In other words, 911 kilometers per hour is 3.21 times the speed of a Helicopter, and the speed of a Helicopter is 0.312 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, the speed of a Skydiver (headfirst) is 0.29 times 911 kilometers per hour.
(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 three-tenths as fast as a Bullet (Rifle).
In other words, 911 kilometers per hour is 0.277 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 3.61 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, 911 kilometers per hour is 4.583556 times the speed of a Tornado, and the speed of a Tornado is 0.2181712 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 five times as fast as a Skydiver (belly-to-earth).
In other words, 911 kilometers per hour is 4.8 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 0.21 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.