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How fast is 17,000 furlongs per fortnight?

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It's about one-one-hundredth as fast as The Speed of Sound
In other words, 17,000 furlongs per fortnight is 0.00824 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 121 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 2,060,000 furlongs per fortnight. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 9,000,000 furlongs per fortnight to 9,380,000 furlongs per fortnight in water, depending on its salinity.
It's about one-fortieth as fast as a Peregrine Falcon
In other words, 17,000 furlongs per fortnight is 0.0262 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 38.20 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 650,000 furlongs per fortnight 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 one-thirty-fifth as fast as The CRH (train)
In other words, the speed of The CRH (train) is 34 times 17,000 furlongs per fortnight.
(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 580,000 furlongs per fortnight. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about one-thirtieth as fast as a Porsche 911
In other words, 17,000 furlongs per fortnight is 0.0309 times the speed of a Porsche 911, and the speed of a Porsche 911 is 32.40 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 550,000 furlongs per fortnight. It takes just 7.4 seconds for the GT2 to accelerate to 269,000 furlongs per fortnight.
It's about one-thirtieth as fast as an Arrow (archery)
In other words, 17,000 furlongs per fortnight is 0.03153 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 31.720 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 539,200 furlongs per fortnight 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-thirtieth as fast as a Lamborghini Gallardo
In other words, the speed of a Lamborghini Gallardo is 31 times 17,000 furlongs per fortnight.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 530,000 furlongs per fortnight. The Gallardo can reach speeds of 170,000 furlongs per fortnight in just 3.9 seconds.
It's about one-thirtieth as fast as The TGV (train)
In other words, the speed of The TGV (train) is 31 times 17,000 furlongs per fortnight.
(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 530,000 furlongs per fortnight. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.