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How fast is 100 kilometers per hour?

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It's about one-third as fast as a Helicopter.
In other words, 100 kilometers per hour is 0.3520 times the speed of a Helicopter, and the speed of a Helicopter is 2.840 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 times as fast as Flo-Jo.
In other words, 100 kilometers per hour is 2.9640 times the speed of Flo-Jo, and the speed of Flo-Jo is 0.33740 times that amount.
(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)
Setting a world record in 1988, Flo-Jo ran a 200 m in 0:21.34 for an average speed of 33.74 kph. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
It's about three-tenths as fast as a Lamborghini Gallardo.
In other words, 100 kilometers per hour is 0.310 times the speed of a Lamborghini Gallardo, and the speed of a Lamborghini Gallardo is 3.20 times that amount.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 320 kph. The Gallardo can reach speeds of 100 kph in just 3.9 seconds.
It's about three-tenths as fast as The TGV (train).
In other words, 100 kilometers per hour is 0.310 times the speed of The TGV (train), and the speed of The TGV (train) is 3.20 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-tenths as fast as an Arrow (archery).
In other words, 100 kilometers per hour is 0.30980 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 3.2280 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-tenths as fast as a Porsche 911.
In other words, 100 kilometers per hour is 0.3040 times the speed of a Porsche 911, and the speed of a Porsche 911 is 3.290 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 329 kph. It takes just 7.4 seconds for the GT2 to accelerate to 161 kilometers per hour.
It's about three-tenths as fast as The CRH (train).
In other words, 100 kilometers per hour is 0.290 times the speed of The CRH (train), and the speed of The CRH (train) is 3.40 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.