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A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches ...

A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches him 3s later. Calculate the velocity of sound in air.

A. 170 ms-1
B. 340 ms-1
C. 680 ms-1
D. 765 ms-1
E. 1530 ms-1




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