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How fast is 8 kilometers per hour?

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It's about one-twenty-fifth as fast as a Tornado
In other words, 8 kilometers per hour is 0.04025077 times the speed of a Tornado, and the speed of a Tornado is 24.844250 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 177.02784 kph and 220.480128 kph. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about one-thirtieth as fast as a Skydiver (headfirst)
In other words, the speed of a Skydiver (headfirst) is 32 times 8 kilometers per hour.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 260 kph. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about one-thirty-fifth as fast as a Helicopter
In other words, the speed of a Helicopter is 35.50 times 8 kilometers per hour.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 284 kph. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
It's about one-fortieth as fast as a Lamborghini Gallardo
In other words, the speed of a Lamborghini Gallardo is 40 times 8 kilometers per hour.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 320 kph. The Gallardo can reach speeds of 100 kph in just 3.9 seconds.
It's about one-fortieth as fast as The TGV (train)
In other words, the speed of The TGV (train) is 40 times 8 kilometers per hour.
(Train à Grande Vitesse) (for SNCF TGV Réseau, a.k.a. "Network" model, a.k.a. TGV-R) (maximum speed)
The TGV Réseau sets have a top speed of 320 kph. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.
It's about one-fortieth as fast as an Arrow (archery)
In other words, 8 kilometers per hour is 0.02478 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 40.360 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 322.8 kph when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
It's about one-fortieth as fast as a Porsche 911
In other words, 8 kilometers per hour is 0.0243 times the speed of a Porsche 911, and the speed of a Porsche 911 is 41.20 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 329 kph. It takes just 7.4 seconds for the GT2 to accelerate to 161 kilometers per hour.