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2011 Section 2 Question 27

27) B

50 beats per minute means after every 60/50 seconds (1.2 seconds), there is one beat.

When soldiers at front put down their right foot, the soldiers at the back put down their left foot.

Therefore, the beat is adjusted to 1 every 30/50 seconds (0.6 seconds).

Minimum distance = (30/50) x 330 = 198 m

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