To hear a distant echo, the surface reflecting the sound should atleast be at a distance

To hear a distant echo, the surface reflecting the sound should atleast be at a distance (Take velocity of sound in air = 340 m/s)
A. 34 m
B. 17 m
C. 51 m
D. 10 m

Anurag Mishra Professor Asked on 29th February 2016 in Maths.
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    Answer: (B) 17 m 

    Anurag Mishra Professor Answered on 1st March 2016.
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