Question

Speed of sound in the air is 350 m/s. How long it will take to hear the echo of a sound from 700m?

Answer 1

speed=350m/s

distance=700m

echo of a sound hear from 700 m is--

time=dis./speed [speed=distance/time]

=700/350

=2 sec.

hence, the echo hear from 700m in 2sec.

Hope it help u