A Tire 1 Meter in Diameter Rotates at a Constant $100 \mathrm { rpm }$

A tire 1 meter in diameter rotates at a constant rate of $100 \mathrm { rpm }$ .What is the speed of a small stone lodged in the tread of the tire on its outer edge? a. $5 \mathrm {~m} / \mathrm { s }$
b. $10 \mathrm {~m} / \mathrm { s }$
c. $20 \mathrm {~m} / \mathrm { s }$ $$\text { d. } 100 \mathrm {~m} / \mathrm { s }$$