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How fast is 17,000 feet per hour?

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It's about one-sixty-five-thousandth as fast as a bolt of Lightning
In other words, the speed of a bolt of Lightning is 67,000 times 17,000 feet per hour.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 1,100,000,000 feet per hour when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 35,000,000 times as fast as Grass growing
In other words, the speed of Grass growing is 0.0000000280 times 17,000 feet per hour.
(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 0.0005 feet 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.
It's about 0.000000005 times as fast as The Speed of Light
In other words, 17,000 feet per hour is 0.00000000480109921021870 times the speed of The Speed of Light, and the speed of The Speed of Light is 208,285,635.479390 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 3,540,855,803,149.60 feet per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 2,360,570,535,472.40 feet per hour when passing through the glass of a typical window.