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How fast is 40,000 furlongs per fortnight?

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It's about 0.00000002 times as fast as The Speed of Light
In other words, 40,000 furlongs per fortnight is 0.0000000221899543330070 times the speed of The Speed of Light, and the speed of The Speed of Light is 45,065,437.4945030 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures 1,802,617,499,780.10 furlongs per fortnight, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 1,201,744,999,873.40 furlongs per fortnight when passing through the glass of a typical window.
It's about one-fifteen-thousandth as fast as a bolt of Lightning
In other words, the speed of a bolt of Lightning is 15,000 times 40,000 furlongs per fortnight.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 580,000,000 furlongs per fortnight when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about one-six-thousandth as fast as a Meteor
In other words, 40,000 furlongs per fortnight is 0.00016 times the speed of a Meteor, and the speed of a Meteor is 6,300 times that amount.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 67,000,000 furlongs per fortnight and 430,000,000 furlongs per fortnight, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 17,000,000 furlongs per fortnight.
It's about one-one-thousandth as fast as The Space Shuttle
In other words, 40,000 furlongs per fortnight is 0.00085908 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 1,164 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 46,561,000 furlongs per fortnight. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.
It's about one-one-hundred-fiftieth as fast as a Bullet (Rifle)
In other words, 40,000 furlongs per fortnight is 0.00727 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 138 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-one-hundredth as fast as a Jet Fighter
In other words, 40,000 furlongs per fortnight is 0.0099 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 100 times that amount.
(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 one-sixtieth as fast as a Bullet (Handgun)
In other words, 40,000 furlongs per fortnight is 0.0173 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 57.80 times that amount.
(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.