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How fast is 745 knots?

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It's about one-eight-hundred-thousandth as fast as The Speed of Light.
In other words, 745 knots is 0.00000127842145752420 times the speed of The Speed of Light, and the speed of The Speed of Light is 782,214.655514780 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 582,749,918.358530 knots, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 388,499,945.578830 knots when passing through the glass of a typical window.
It's about one-two-hundred-fiftieth as fast as a bolt of Lightning.
In other words, the speed of a bolt of Lightning is 260 times 745 knots.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 190,000 knots when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about one-one-hundredth as fast as a Meteor.
In other words, 745 knots is 0.0091 times the speed of a Meteor, and the speed of a Meteor is 110 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 22,000 knots and 140,000 knots, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 5,400 knots.
It's about one-twentieth as fast as The Space Shuttle.
In other words, 745 knots is 0.049494 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 20.2040 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 15,052 knots. 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 two-fifths as fast as a Bullet (Rifle).
In other words, 745 knots is 0.4190 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 2.390 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 1,780 knots. 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 three-fifths as fast as a Jet Fighter.
In other words, 745 knots is 0.570 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 1.80 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 nan knots. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about as fast as a Bullet (Handgun).
In other words, the speed of a Bullet (Handgun) is 1 times 745 knots.
(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 745 knots. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.