A man standing 68m from a wall fires a gun. If the speed of sound is 340ms calculate the time after which the echo is heard.
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D = 68m
speed = 340ms
speed = distance / time
time= distance / speed
= 68/340
time = 0.2 seconds
speed = 340ms
speed = distance / time
time= distance / speed
= 68/340
time = 0.2 seconds
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