Sounds travel at approximately 1200 km/hr. A gun is fired. After what time will you hear the sound if you are 3 km away from the gun?
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https://www.meritnation.com/ask-answer/question/sound-travels-at-approximately-1200km-hr-a-gun-is-fired-at/math/8830367
https://www.meritnation.com/ask-answer/question/sound-travels-at-approximately-1200km-hr-a-gun-is-fired-at/math/8830367