How a Wheel Turns

All 6 wheels in the diagram rotate as they touch each other without slipping. The diameter of the leftmost wheel is 15.7 cm and it makes 12 revolutions per minute.

It is known that the smallest wheel makes one revolution per second.

What is the diameter of the smallest wheel?

Difficulty level (1 very easy - 10 very hard): 1

Topics:
Arithmetic Geometry -> Plane Geometry -> Circles Algebra -> Word Problems
Sources:
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