Calculate Speed of Sound with Echo Measurement

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Can someone tell me how to calculate the speed of sound through measuring echoes. This is very new to me so I do not know where to begin. Appreciate any help. Links will help as well.
 
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If the source and the reflector are stationary then the time it takes sound to travel from the source to the reflector is the same time it takes for the sound to travel from the reflector back to the source.
 
I know what you mean by if the materials are in position and not moving but i just need to know how you get the speed of sound from taking two points off (the echoes) a sound wave chart and calculating the speed of sound from that.
 
Divide the distance traveled by the time of travel to find the speed of sound.
 

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