The minute hand of a wall clock is 9 cm long; the second hand is 12 cm…

Step 1. (a) Minute hand: $3600\ \text{s}$. Second hand: $60\ \text{s}$.

Step 2. (b) $\dfrac{2\pi \times 0.09\ \text{m}}{3600\ \text{s}} = 0.000157\ \text{m/s}$.

Step 3. (c) $\dfrac{1}{60}$ turn each second.

Step 4. (d) Second tip: $\dfrac{2\pi \times 0.12\ \text{m}}{60\ \text{s}} = 0.0126\ \text{m/s}$, about $80$ times faster.