YES
But ideally, NO.
Explanation:
Ideally, the calculated average speed should NOTinclude stopped time.
But on a device like a GPS, time spent stopped IS included in your average speed,
thus lowering it significantly.
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The speed of light in vacuum is 299,792,458 meters per second, and that's not an average. That's what it always is.
3/4th
About 2/3 its speed in a vacuum.
There are several different types of glass, and light has a somewhat different speed in each of them. On the average, the speed of light across all typical types of glass is in the neighborhood of 2/3 its speed in vacuum, or around 200,000 km/sec .
Depends on your average speed. Distance = Speed*Time. If travelling at the speed of light, 1.08 billion kilometres. If at the speed of a garden snail, 0.05 kilometers.