How can you tell how far thunder/lightening is?

Question

I know there is a way to find out, but I forget. What is it?

Answer 1

see the lightning, count by mississippi's, then divide by... 5

Answer 2

Going back to my school days, we were taught to count the seconds and multiply that by 1100 (the speed of sound).  The 1100 are feet so if it were 5 seconds then the lightening would be 5500 feet away which would be about a mile.

Answer 3

When you see the lighting count in seconds until you hear the thunder. Divide the number that you get by 5 and the answer is the number of miles away the lighting strike was.

Answer 4

you see a lightning flash almost immediately it happens while the sound can take several seconds to reach an observer. If you count the gap between the lighting and the thunder, you can tell how far away the storm is. For every kilometre count 3 seconds, for every mile count 5 seconds. So if you count 15 seconds, the storm is 5 km or 3 m away from where you are.