The time taken by sound to reach your ear is 0.25 second.
Time of echo :
The speed of sound at temperature of 0º C is 331.5m/s
the relation between distance , time and velocity is,
[tex]x=v*t\\\\t=\frac{x}{v}[/tex]
Where, x is distance, v is velocity and t is time.
Given that, [tex]x=82m,v=331.5m/s[/tex]
Substitute values in above relation.
[tex]t=\frac{82}{331.5}=0.25second[/tex]
the time taken by sound to reach your ear is 0.25 second.
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