To find out how many school-supply kits the volunteers can put together in 30 minutes using a unit rate, we first need to determine the rate at which they assemble the kits.
Given:
- They assemble 40 school-supply kits in 8 minutes.
First, we can find the rate of kits per minute: \[ \text{Rate} = \frac{\text{Number of kits}}{\text{Time (in minutes)}} = \frac{40 \text{ kits}}{8 \text{ minutes}} = 5 \text{ kits per minute}. \]
Next, we need to find out how many kits they can assemble in 30 minutes by using this rate: \[ \text{Kits in 30 minutes} = \text{Rate} \times \text{Time} = 5 \text{ kits/minute} \times 30 \text{ minutes} = 150 \text{ kits}. \]
Therefore, at this rate, the volunteers can put together 150 school-supply kits in 30 minutes.