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How fast is 350 kilometers per hour?

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It's about three times as fast as a Knuckleball (baseball)
In other words, 350 kilometers per hour is 3.20 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 0.310 times that amount.
(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 110 kph. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about three-tenths as fast as The Speed of Sound
In other words, 350 kilometers per hour is 0.2830 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 3.530 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 343 m/s. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 5,390 kilometers per hour to 5,620 kilometers per hour in water, depending on its salinity.
It's about one-fourth as fast as a Bullet (Handgun)
In other words, 350 kilometers per hour is 0.2530 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 3.950 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 1,380 kph. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about five times as fast as a Greyhound
In other words, 350 kilometers per hour is 4.840 times the speed of a Greyhound, and the speed of a Greyhound is 0.2070 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 72.4 kph. 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 five times as fast as a Gazelle
In other words, the speed of a Gazelle is 0.20 times 350 kilometers per hour.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 80 kph. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about five times as fast as a Hare
In other words, the speed of a Hare is 0.20 times 350 kilometers per hour.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 72 kph. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about six times as fast as Secretariat
In other words, 350 kilometers per hour is 5.790 times the speed of Secretariat, and the speed of Secretariat is 0.1730 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 60.4 kph in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.