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Consider the section drawing of a concert hall above. There are three marked paths of sound from point A on the stage to point B

Consider the section drawing of a concert hall above. There are three marked paths of sound from point A on the stage to point B on the balcony. If the speed of sound is 344 m/s, what it the difference in time between the arrival of the direct sound and the last early sound?

A. 68.19 ms

B. 89.08 ms

C. 67.84 ms

D. 21.00 ms

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