If you hear a gun shot two second after has fired how far away from the gun are you

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We will use the following simple relation, distance travelled by the sound = speed of sound X time taken d = s X t here s = 340 m/s t = 2 s thus, the total distance is D = 340 X 2 = 680 m as the sound reflects back along the same path, the distance to the hill will be half of the total distance travelled by the sound wave. So, d = 680/2 = 340 m.
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no
 
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680 m
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680m
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