You see lightning and 50 seconds later you hear thunder. how far away is the thunderstorm? take the speed of sound to be 332 m/s

The light travels at speed of , so it's very huge compared to the speed of sound, therefore we can assume that the light coming from the thunderstorm arrives to us istantaneously.

This means that 50 seconds is the time the sound of the thunder takes to arrive to us. So, using the basic relationship between space and time:

We find the distance covered by the sound in 50 seconds, i.e. how far is the thunderstorm:

Ithink d is the right answer. hope this !