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How fast is 0.0278 miles per second?

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It's about half as fast as a Porsche 911
In other words, 0.0278 miles per second is 0.4890 times the speed of a Porsche 911, and the speed of a Porsche 911 is 2.04 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 0.0568 miles per second. It takes just 7.4 seconds for the GT2 to accelerate to 0.0278 miles per second.
It's about half as fast as The CRH (train)
In other words, 0.0278 miles per second is 0.460 times the speed of The CRH (train), and the speed of The CRH (train) is 2.20 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 0.06 miles per second. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about two times as fast as a Greyhound
In other words, 0.0278 miles per second is 2.230 times the speed of a Greyhound, and the speed of a Greyhound is 0.4480 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0125 miles per second. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about two-fifths as fast as a Peregrine Falcon
In other words, 0.0278 miles per second is 0.4140 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 2.420 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.0671 miles per second when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about two-and-a-half times as fast as Secretariat
In other words, 0.0278 miles per second is 2.660 times the speed of Secretariat, and the speed of Secretariat is 0.3760 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 0.0104 miles per second in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about four-and-a-half times as fast as Michael Johnson
In other words, 0.0278 miles per second is 4.3230 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.23130 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 0.006433 miles per second at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.
It's about four-and-a-half times as fast as Usain Bolt
In other words, 0.0278 miles per second is 4.340 times the speed of Usain Bolt, and the speed of Usain Bolt is 0.230 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 0.00642 miles per second at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.