The minute hand of a clock is $1.5$ cm long. How far does its tip travel in $40$ minutes? (Use $\pi = 3.14$.)

In 60 minutes the minute hand completes $2\pi$ rad. In 40 minutes: $\theta = \dfrac{40}{60} \cdot 2\pi = \dfrac{4\pi}{3}$ rad. $l = r\theta = 1.5 \cdot \dfrac{4\pi}{3} = 2\pi \approx 6.28$ cm.