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How fast is 911 kilometers per hour?

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 It's about six times as fast as a Fastball (baseball). In other words, 911 kilometers per hour is 6.20 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 0.160 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 150 kph. 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 seven-and-a-half times as fast as a Curveball (baseball). In other words, the speed of a Curveball (baseball) is 0.140 times 911 kilometers per hour. (a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)The average speed of major league curveball pitch is 120 kph. 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 seven-and-a-half times as fast as a Hurricane. In other words, 911 kilometers per hour is 7.650 times the speed of a Hurricane, and the speed of a Hurricane is 0.1310 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 119 kph. 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 310 kph (192.63 mph). It's about eight times as fast as a Cheetah. In other words, 911 kilometers per hour is 8.2460 times the speed of a Cheetah, and the speed of a Cheetah is 0.12130 times that amount. (Acinonyx jubatus)The cheetah can reach speeds of up to 101 - 120 km/h in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds. It's about eight-and-a-half times as fast as a Knuckleball (baseball). In other words, the speed of a Knuckleball (baseball) is 0.120 times 911 kilometers per hour. (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 ten times as fast as a Gazelle. In other words, the speed of a Gazelle is 0.10 times 911 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 ten times as fast as a Hare. In other words, the speed of a Hare is 0.10 times 911 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.