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2 kilometers per hour is about 0.000000002 times as fast as The Speed of Light
In other words, it's 0.0000000018531338622120 times the speed of The Speed of Light, and the speed of The Speed of Light is 539,626,424.399990 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.
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