Question

A man stands some distance away from a cliff. He gives a shout and hears his echo 4s later. How far away is he from the cliff? (The speed of sound in air is 330m/s)

Answer 1

Given,
= t = 4 sec
= v = 330 m/s

Solution,
Distance,(d)= v*t/2
=330*4/2
=1320/2
=660 m