A lawnmower blade has a diameter of 36 inches and spins at a rate of 60 revolutions per minute. What is the linear velocity, in inches per minute, at the end of the blade?

The blade tip travels one circumference in each revolution. With a diameter of 36 inches, the circumference is π × 36 = 36π inches. At 60 revolutions per minute, its linear velocity is 36π × 60 = 2,160π inches per minute, so the correct choice is 2,160π.

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