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How fast is 391 meters per hour?

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It's about one-six-hundred-fiftieth as fast as a Skydiver (headfirst).
In other words, the speed of a Skydiver (headfirst) is 670 times 391 meters 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 260,000 meters per hour. 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-seven-hundredth as fast as a Helicopter.
In other words, 391 meters per hour is 0.00138 times the speed of a Helicopter, and the speed of a Helicopter is 725 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 284,000 meters per hour. 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 one-eight-hundred-fiftieth as fast as an Arrow (archery).
In other words, 391 meters per hour is 0.001211 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 825.8 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 322,800 meters per hour 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 one-eight-hundred-fiftieth as fast as a Lamborghini Gallardo.
In other words, the speed of a Lamborghini Gallardo is 830 times 391 meters per hour.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 320,000 meters per hour. The Gallardo can reach speeds of 100,000 meters per hour in just 3.9 seconds.
It's about one-eight-hundred-fiftieth as fast as The TGV (train).
In other words, the speed of The TGV (train) is 830 times 391 meters per hour.
(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 320,000 meters per hour. 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-eight-hundred-fiftieth as fast as a Porsche 911.
In other words, 391 meters per hour is 0.00119 times the speed of a Porsche 911, and the speed of a Porsche 911 is 840 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 329,000 meters per hour. It takes just 7.4 seconds for the GT2 to accelerate to 161,000 meters per hour.
It's about one-nine-hundredth as fast as The CRH (train).
In other words, 391 meters per hour is 0.0011 times the speed of The CRH (train), and the speed of The CRH (train) is 910 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 350,000 meters per hour. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.