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How fast is 45 miles per second?

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It's about 3,500 times as fast as a Greyhound
In other words, the speed of a Greyhound is 0.000278 times 45 miles per second.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0125 miles per second. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about 2,500 times as fast as a Knuckleball (baseball)
In other words, the speed of a Knuckleball (baseball) is 0.00042 times 45 miles per second.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 0.019 miles per second. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about 2,500 times as fast as a Cheetah
In other words, 45 miles per second is 2,360 times the speed of a Cheetah, and the speed of a Cheetah is 0.0004237 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 0.01907 miles per second in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about 2,000 times as fast as a Hurricane
In other words, 45 miles per second is 2,190 times the speed of a Hurricane, and the speed of a Hurricane is 0.000457 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 0.0205 miles per second. 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 0.0535 miles per second.
It's about 2,000 times as fast as a Curveball (baseball)
In other words, 45 miles per second is 2,100 times the speed of a Curveball (baseball), and the speed of a Curveball (baseball) is 0.00048 times that amount.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 0.021 miles per second. 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 2,000 times as fast as a Fastball (baseball)
In other words, 45 miles per second is 1,800 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 0.00056 times that amount.
(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 0.026 miles per second. 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 1,500 times as fast as a Skydiver (belly-to-earth)
In other words, the speed of a Skydiver (belly-to-earth) is 0.00071 times 45 miles per second.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 0.033 miles per second. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.