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How fast is 100 kilometers per hour?

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It's about one-three-thousand-five-hundredth as fast as a bolt of Lightning.
In other words, the speed of a bolt of Lightning is 3,600 times 100 kilometers per hour.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 350,000 kph when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 0.00000010 times as fast as The Speed of Light.
In other words, 100 kilometers per hour is 0.00000009265669310 times the speed of The Speed of Light, and the speed of The Speed of Light is 10,792,528.50 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 exactly 1,079,252,850 kilometers per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 719,501,899 kilometers per hour when passing through the glass of a typical window.
It's about 700,000,000 times as fast as Grass growing.
In other words, 100 kilometers per hour is 690,000,000 times the speed of Grass growing, and the speed of Grass growing is 0.00000000140 times that amount.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.000000150 kilometers per hour in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.