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How fast is 504 feet per hour?

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It's about one-one-thousand-five-hundredth as fast as a Skydiver (headfirst).
In other words, the speed of a Skydiver (headfirst) is 1,700 times 504 feet 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 850,000 feet 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-two-thousandth as fast as a Helicopter.
In other words, 504 feet per hour is 0.000541 times the speed of a Helicopter, and the speed of a Helicopter is 1,850 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 932,000 feet 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-two-thousandth as fast as a Lamborghini Gallardo.
In other words, 504 feet per hour is 0.00048 times the speed of a Lamborghini Gallardo, and the speed of a Lamborghini Gallardo is 2,100 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 1,000,000 feet per hour. The Gallardo can reach speeds of 330,000 feet per hour in just 3.9 seconds.
It's about one-two-thousandth as fast as The TGV (train).
In other words, 504 feet per hour is 0.00048 times the speed of The TGV (train), and the speed of The TGV (train) is 2,100 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 1,000,000 feet 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-two-thousandth as fast as an Arrow (archery).
In other words, 504 feet per hour is 0.0004759 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 2,101 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 1,059,000 feet 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-two-thousandth as fast as a Porsche 911.
In other words, 504 feet per hour is 0.000467 times the speed of a Porsche 911, and the speed of a Porsche 911 is 2,140 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 1,080,000 feet per hour. It takes just 7.4 seconds for the GT2 to accelerate to 528,000 feet per hour.
It's about one-two-thousand-five-hundredth as fast as The CRH (train).
In other words, the speed of The CRH (train) is 2,300 times 504 feet per hour.
(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 1,100,000 feet per hour. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.