### What is the approximate length of the column

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A column of soldiers, marching at 141 paces per minute, keep in step with the beat of a drummer at the head of the column. It is observed that the soldiers in the rear end of the column are striding forward with the left foot when the drummer is advancing with the right. The speed of sound in the air is 343 m/s. What is the approximate length of the column?

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