two buildings are 3.3km apart. agun is fired from 1 buildind. the time difference between seeing the flash of gun and its sound is 10s.find the speed of sound in air.
Now, as the difference bewteen the flash and sound is 10 seconds, the time taken by the sound to travel to the other building will be = 10 seconds.
now, distance = 3.3km = 3300m
so, speed of sound = distance / time = 3300/10
thus,
v = 330 m/s