# An echo is heard in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is $342\: m\: s^{-1}$?

Given the speed of sound is $342\: m\: s^{-1}$.

The time taken by the sound to travel from the source to the reflecting surface will be half of this time:

$= \frac{3}{2} seconds$

Hence,

$Distance = Speed\times Time$

Substituting the values in the equation, we get the distance,

$Distance = 342\ m/s\times 1.5s = 513\ m$

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