Question

20. A gun is fired in the air at a distance of 900m from a person. He hears the sound of the gun after 3 seconds. What is the speed of sound?

Answer 1

To find speed =>v= 2d/t

v =speed
d=distance
t=time

v=2×900/3
v=1800/3
v=600m/s

Answer 2

So...for Speed of Sound

V= Total distance Travelled/Time interval
=2d/t
(in case of echoes its 2d)

Therefore, V=2*900/3
V=1800/3
V=600ms^-1
Therefore Speed of sound is 600 metre per second!!

Hope Its Helpful!!!