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How fast is 45 miles per second?

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It's about 650 times as fast as a Peregrine Falcon
In other words, 45 miles per second is 671 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.00149 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 750 times as fast as The CRH (train)
In other words, the speed of The CRH (train) is 0.0013 times 45 miles per second.
(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 800 times as fast as a Porsche 911
In other words, 45 miles per second is 792 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.00126 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 800 times as fast as an Arrow (archery)
In other words, 45 miles per second is 807.60 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.001238 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 0.05572 miles per second 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 800 times as fast as a Lamborghini Gallardo
In other words, 45 miles per second is 810 times the speed of a Lamborghini Gallardo, and the speed of a Lamborghini Gallardo is 0.0012 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 0.055 miles per second. The Gallardo can reach speeds of 0.017 miles per second in just 3.9 seconds.
It's about 800 times as fast as The TGV (train)
In other words, 45 miles per second is 810 times the speed of The TGV (train), and the speed of The TGV (train) is 0.0012 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 0.055 miles per second. 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 900 times as fast as a Helicopter
In other words, 45 miles per second is 918 times the speed of a Helicopter, and the speed of a Helicopter is 0.00109 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 0.049 miles per second. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.