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Answer :
Speed of sound (v) = 342 m/s
Echo returns in time (t) = 3 s
Distance travelled by sound
=\( v × t = 342 × 3 = 1026 m \)
In the given interval of time, sound must travel a distance which is twice the distance of reflecting surface and source.
Therefore, the distance of reflecting surface from the source =\( \frac{1026}{2} = 513 m \).