Lightning
Lightning and thunder happen simultaneously, but lightning travels near the speed of light while thunder moves at the speed of sound, approximately 866,000 times slower than the speed of light, which explains the delay between the two phenomena.The discharge of a lightning bolt can reach 30 million volts–the equivalent of 2.5 million car batteries!
Every second between the time a lightning bolt strikes the ground and the time we hear the thunder corresponds to 300 metres. So, if we count 3 seconds, the lightning struck 900 metres away.

