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How fast is 87 knots?

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It's about 0.0000002 times as fast as The Speed of Light
In other words, 87 knots is 0.00000014929217020752 times the speed of The Speed of Light, and the speed of The Speed of Light is 6,698,274.9236613 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-thousandth as fast as a bolt of Lightning
In other words, 87 knots is 0.0005 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 2,200 times that amount.
(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-nine-hundredth as fast as a Meteor
In other words, 87 knots is 0.001 times the speed of a Meteor, and the speed of a Meteor is 910 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-one-hundred-fiftieth as fast as The Space Shuttle
In other words, 87 knots is 0.005780 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 173.0 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 one-twentieth as fast as a Bullet (Rifle)
In other words, 87 knots is 0.049 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 20.4 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 one-fifteenth as fast as a Jet Fighter
In other words, 87 knots is 0.07 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 15 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 1,300 knots. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-tenth as fast as a Bullet (Handgun)
In other words, 87 knots is 0.117 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 8.55 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 745 knots. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.