Not fast at all. 80 mm per second = 0.18 mph.
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To convert 80 millimeters per second to miles per hour, you first convert millimeters to miles and seconds to hours. There are approximately 0.000000621371 miles in a millimeter and 3600 seconds in an hour. So, 80 millimeters per second is roughly 10.56 miles per hour.
186,282 miles a second 299,792,458 meters a second 670,616,629.4 miles an hour
360,000 miles per hour.
17 miles per second is 61,200 miles per hour.
5 km per second is equivalent to 18,000 km per hour. This is very fast, nearly 11,185 miles per hour. For context, the speed of sound is around 1,225 km per hour.
The speed of light is approximately 186,282 miles per second. To convert this to miles per hour, we multiply by 3600 (the number of seconds in an hour), resulting in approximately 670,616,629 miles per hour.