A man firs a gun and hears its echo after 5 s. The man then moves 310 m towards the hill and fires his gun again. This time if he hears the echo after 3s. Calculate the speed of sound.
Let x be the total distance between man and hill
v be the velocity of sound
so v=
second case
distance is 2(x-310)
so v=...........(1)
since the velocity of sound doesn't change
Put this value in (1),
v = 2×7755 =310m/s