Question

A man standing in front of a wall produces a sound and hears an echo after 3s.
He walks ‘x’ m away from the wall and produces the same sound. Now he hears an echo after 5.25s. Calculate the distance he walked away from the wall. (Speed of sound in air is 340 m/s)

Answer 1

distance for first echo = 340*3/2
510m
distance for second echo = 340*5.25/2
892.5m
therefore distance he walks away =>
892.5-510=> 382.5m