No. I believe it is 5 seconds per mile. IOW, when lightning hits, it takes 5 seconds to travel a mile. If I saw that flash and then counted 5 seconds, it would mean it was a mile away but since I counted just under a second as you can hear in the video, that lightning strike was less than a quarter mile away.
NO, sound travels at 5 seconds per mile approximately at sea level, 5 miles a second is orbital velocity for Earth.