Question

An echo returned in 3 s what is the distance considering speed os 342 m/s

Answer 1

speed = 342m/s
time= 3 sec
Echo covers the distance two times.
So,
time we take is 1.5 sec
distance= speed *time
=1.5×342

=513m

Answer 2

☆$\red {HELLO\:DEAR}$☆

Speed of sound, v = 342 m s−1

Echo returns in time, t = 3 s

Distance travelled by sound = v × t = 342 × 3 = 1026 m

In the given time interval, sound has to travel a distance that is twice the distance of the reflecting surface and the source.

Hence, the distance of the reflecting surface from the source = (1026/2)m= 513m

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