How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash?

The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)

A. 1320m
B. 660m
C. 600m
D. 330m
E. 165m

Correct Answer:

Option D – 330m