Question

The sound of thunder is heard 30 seconds after seeing the lightning flash. Given that the speed of sound is 330m/s,estimate the distance at which lightning could have occurred?

Answer 1

see the attached document please.......
 i hope it helps............

f8d10f214a1e0aca443a3cc2821a71ae.docx

Answer 2

We know that the speed of light is more than the speed of sound in air, so we always see the lightening first and heard the sound later .
now,A/q
distance = speed × time 
              = 330×30
              = 9900 m
              = 9.9 km