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How fast is 87 knots?

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It's about half as fast as a Porsche 911
In other words, 87 knots is 0.49 times the speed of a Porsche 911, and the speed of a Porsche 911 is 2.0 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 178 knots. It takes just 7.4 seconds for the GT2 to accelerate to 86.90 knots.
It's about half as fast as The CRH (train)
In other words, 87 knots is 0.46 times the speed of The CRH (train), and the speed of The CRH (train) is 2.2 times that amount.
(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 190 knots. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about two times as fast as a Greyhound
In other words, 87 knots is 2.23 times the speed of a Greyhound, and the speed of a Greyhound is 0.448 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 39.10 knots. 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 two-fifths as fast as a Peregrine Falcon
In other words, 87 knots is 0.414 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 2.42 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 210 knots when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about two-and-a-half times as fast as Secretariat
In other words, 87 knots is 2.66 times the speed of Secretariat, and the speed of Secretariat is 0.376 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 32.60 knots in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about four-and-a-half times as fast as Michael Johnson
In other words, 87 knots is 4.324 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.2313 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 20.120 knots at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.
It's about four-and-a-half times as fast as Usain Bolt
In other words, 87 knots is 4.35 times the speed of Usain Bolt, and the speed of Usain Bolt is 0.23 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 20.10 knots at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.