Aditi clapped her hands near a cliff and heard the echo after 4 s. What is the distance of the cliff from her, if the speed of sound is taken as 346 m${{s}^{-1}}$?

Time taken for hearing the echo, t = 4 s

.’. Distance travelled by the sound = v x t

= 346 x 4 = 1384m

In 4 s, sound has to travel twice the distance between the cliff and Aditi. Therefore, the distance between the cliff and Aditi is 1384/2 = 692 m.