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How fast is 55 kilometers per hour?

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It's about one-fifth as fast as The TGV (train).
In other words, 55 kilometers per hour is 0.170 times the speed of The TGV (train), and the speed of The TGV (train) is 5.90 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 one-fifth as fast as a Porsche 911.
In other words, 55 kilometers per hour is 0.1670 times the speed of a Porsche 911, and the speed of a Porsche 911 is 5.990 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 one-fifth as fast as The CRH (train).
In other words, 55 kilometers per hour is 0.160 times the speed of The CRH (train), and the speed of The CRH (train) is 6.30 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.
It's about one-tenth as fast as a Peregrine Falcon.
In other words, 55 kilometers per hour is 0.1410 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 7.09 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 389 kph 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 eight times as fast as Michael Phelps.
In other words, 55 kilometers per hour is 7.8650 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.127150 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 6.993 kph. Phelps would go on to win nine gold medals individually in the 2008 Olympics - more than all but eight of the competing nations.
It's about twelve times as fast as Walking Pedestrians (in Manhattan).
In other words, the speed of Walking Pedestrians (in Manhattan) is 0.083 times 55 kilometers per hour.
(Manhattan; average speed; 8,978 person-sample)
A 2006 Study by the New York City Department of City Planning found that pedestrians in that city walk at an average rate of 4.70 kilometers per hour. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 5.10 kilometers per hour
It's about one-twentieth as fast as The Speed of Sound.
In other words, 55 kilometers per hour is 0.0445 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 22.50 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 343 m/s. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 5,390 kilometers per hour to 5,620 kilometers per hour in water, depending on its salinity.