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How fast is 150 kilometers per hour?

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It's about one-two-thousand-five-hundredth as fast as a bolt of Lightning.
In other words, the speed of a bolt of Lightning is 2,300 times 150 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 0.0000002 times as fast as The Speed of Light.
In other words, 150 kilometers per hour is 0.000000138985040 times the speed of The Speed of Light, and the speed of The Speed of Light is 7,195,018.970 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 1,000,000,000 times as fast as Grass growing.
In other words, the speed of Grass growing is 0.000000001000 times 150 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.