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How fast is 4,000,000 furlongs per fortnight?

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It's about as fast as a Jet Fighter
In other words, the speed of a Jet Fighter is 1 times 4,000,000 furlongs per fortnight.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 4,000,000 furlongs per fortnight. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about three-fourths as fast as a Bullet (Rifle)
In other words, 4,000,000 furlongs per fortnight is 0.7270 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 1.380 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 5,500,000 furlongs per fortnight. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about one-and-three-fourths times as fast as a Bullet (Handgun)
In other words, the speed of a Bullet (Handgun) is 0.5780 times 4,000,000 furlongs per fortnight.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 2,300,000 furlongs per fortnight. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about one-and-nine-tenths times as fast as The Speed of Sound
In other words, 4,000,000 furlongs per fortnight is 1.940 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.5150 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 six times as fast as a Peregrine Falcon
In other words, 4,000,000 furlongs per fortnight is 6.160 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.1620 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 seven times as fast as The CRH (train)
In other words, 4,000,000 furlongs per fortnight is 6.90 times the speed of The CRH (train), and the speed of The CRH (train) is 0.140 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 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 seven-and-a-half times as fast as a Porsche 911
In other words, 4,000,000 furlongs per fortnight is 7.280 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.1370 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.