How many degrees does the hour hand of a clock rotate between 4pm and 9pm?

The hour hand of a clock completes a full rotation of 360 degrees in 12 hours. From 4 PM to 9 PM is a span of 5 hours. Therefore, the hour hand rotates ( \frac{360 \text{ degrees}}{12 \text{ hours}} \times 5 \text{ hours} = 150 \text{ degrees} ) between 4 PM and 9 PM.