Question

please answer this question.

Answer 1

Becoz Light have more speed then the sound. So , the lightning is seen before the thunder.

XD, Hope it will help.
Comment if you need a long answer

Answer 2

Its an experimental fact that the velocity of light is 3*10^8m/s

while velocity of sound in air is 340m/s

And this is why see light than before we could here the thunder.