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A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km ...

A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 ms-1]

A. 30 s
B. 10 s
C. 10 s
D. 15 s




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