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How fast is 390,000 inches per hour?

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It's about 40 times as fast as a Sloth
In other words, 390,000 inches per hour is 41 times the speed of a Sloth, and the speed of a Sloth is 0.024 times that amount.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 9,400 inches per hour. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.
It's about one-one-hundredth as fast as The Speed of Sound
In other words, 390,000 inches per hour is 0.00802 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 125 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 48,600,000 inches per hour. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 212,000,000 inches per hour to 221,000,000 inches per hour in water, depending on its salinity.
It's about one-one-hundred-fiftieth as fast as a Bullet (Handgun)
In other words, 390,000 inches per hour is 0.00717 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 139 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 54,300,000 inches per hour. 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-two-hundred-fiftieth as fast as a Jet Fighter
In other words, the speed of a Jet Fighter is 240 times 390,000 inches per hour.
(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 95,000,000 inches per hour. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-three-hundred-fiftieth as fast as a Bullet (Rifle)
In other words, 390,000 inches per hour is 0.00301 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 332 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 130,000,000 inches per hour. 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-three-thousandth as fast as The Space Shuttle
In other words, 390,000 inches per hour is 0.00035535 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 2,814.10 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 1,097,500,000 inches per hour. 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-fifteen-thousandth as fast as a Meteor
In other words, the speed of a Meteor is 15,000 times 390,000 inches per hour.
(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 1,600,000,000 inches per hour and 10,000,000,000 inches per hour, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 390,000,000 inches per hour.