Question

a man fires the gun and hears its echo after 5 seconds then the man moves 340 metre towards the hill amd fires the gun again this time he hears the Echo after 3 seconds calculate the speed of sound.calculate speed of sound and original distance.

Answer 1

let x be total distance between man and hill
v be velocity of sound
so v=2x/5
second case
distance is 2(x-340)
so v=2(x-340)/3
since velocity of sound doesn't change
2x/5=2(x-340)/3
x=850 m
v=340m/s

Answer 2

To calculate echo :

2d=v×t

D=340 ×5/2

D=850m

HOPE this helps u