问题描述：
数学问题,英文的,和revolution有关
A gear is driven by a chain that travels 2.5 m per second. Find the radius of the gear if it makes 4π revolutions per minute.
A gear is driven by a chain that travels 2.5 m per second. Find the radius of the gear if it makes 4π revolutions per minute.
问题解答：
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