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How fast is 8 kilometers per hour?

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It's about one-forty-five-thousandth as fast as a bolt of Lightning
In other words, the speed of a bolt of Lightning is 43,000 times 8 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 55,000,000 times as fast as Grass growing
In other words, the speed of Grass growing is 0.0000000180 times 8 kilometers 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 0.000000150 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.
It's about 0.000000008 times as fast as The Speed of Light
In other words, 8 kilometers per hour is 0.00000000741253544884780 times the speed of The Speed of Light, and the speed of The Speed of Light is 134,906,606.10 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 1,079,252,848.80 kilometers per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 719,501,899.2120 kilometers per hour when passing through the glass of a typical window.