Why is lightning faster than thunder ?

Ah Beng and Ah Lian were on the beach on a stormy night. There were lightning and thunder all over the place. Ah Lian asked Ah Beng, “Why is it we always see the lightning before we hear the thunder ?

Ah Beng replied, “Ai yah. So simple also you don’t know. Because our eyes are in front of our ears mah!”