Ramesh measured the time gap between lightning and thunder and found that it was 3 seconds. Assuming light covers the distance instantly, what is the distance of the clouds from Ramesh?

Sound travels at approximately 340 metres per second. (It varies according to atmospheric density, the amount of moisture in the air and temperature.) So we can assume that in 3 seconds, the sound will have travelled 1020 metres, or just over a kilometre.