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How fast is 390,000 inches per hour?

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It's about one-tenth as fast as a Cheetah
In other words, 390,000 inches per hour is 0.08966 times the speed of a Cheetah, and the speed of a Cheetah is 11.150 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 4,350,000 inches per hour in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-tenth as fast as a Hurricane
In other words, 390,000 inches per hour is 0.0831 times the speed of a Hurricane, and the speed of a Hurricane is 12 times that amount.
(formally: Topical cyclone; a.k.a. typhoon)
A hurricane is defined by the US National Hurricane Center as a Northern Hemisphere tropical storm having one-minute average wind-speeds of at least 4,690,000 inches per hour. Typhoons Tip (October, 1979) and Keith (October, 1997) and Hurricanes Camille (August, 1969) and Allen (August, 1980) jointly hold the record for highest tropical storm wind speeds at 12,200,000 inches per hour.
It's about one-tenth as fast as a Curveball (baseball)
In other words, the speed of a Curveball (baseball) is 12 times 390,000 inches per hour.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 4,700,000 inches per hour. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
It's about one-fifteenth as fast as a Fastball (baseball)
In other words, the speed of a Fastball (baseball) is 15 times 390,000 inches per hour.
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 5,900,000 inches per hour. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
It's about one-twentieth as fast as a Skydiver (belly-to-earth)
In other words, the speed of a Skydiver (belly-to-earth) is 19 times 390,000 inches per hour.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 7,500,000 inches per hour. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.
It's about one-twentieth as fast as a Tornado
In other words, 390,000 inches per hour is 0.04984051 times the speed of a Tornado, and the speed of a Tornado is 20.064 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 6,969,600 inches per hour and 8,680,320 inches per hour. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about one-twenty-fifth as fast as a Skydiver (headfirst)
In other words, the speed of a Skydiver (headfirst) is 26 times 390,000 inches per hour.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 10,000,000 inches per hour. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.