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The problem states:

"Volunteers put together 40 school-supply kits in 8 minutes. At this rate, how many could they put together in 30 minutes? Solve this problem using a unit rate."

We can solve this by determining the number of kits made per minute and then multiplying by the number of minutes in 30 minutes.

### Step-by-step solution:

1. **Find the rate per minute**:
   \[
   \frac{40 \text{ kits}}{8 \text{ minutes}} = 5 \text{ kits per minute}
   \]

2. **Calculate the number of kits in 30 minutes**:
   \[
   5 \text{ kits per minute} \times 30 \text{ minutes} = 150 \text{ kits}
   \]

Thus, the volunteers can put together **150 school-supply kits** in 30 minutes.

### Correct answer:
- **150 school-supply kits**

Would you like more details, or do you have any questions? Here are some related questions to explore:

1. How can you determine the unit rate for other situations?
2. What is the general formula for scaling unit rates to different time intervals?
3. How would the number of kits change if the volunteers worked for 60 minutes?
4. If the volunteers worked for only 4 minutes, how many kits would they assemble?
5. How can you apply unit rates to real-world situations outside of time-based tasks?

**Tip**: When working with unit rates, it's often easiest to first find the rate for one unit (e.g., per minute) and then scale up or down based on the given conditions.

Volunteers put together 40 school-supply kits in 8 minutes. At this rate, how many could they put together in 30 minutes? Solve this problem using a unit rate.

Learn how to calculate the number of school-supply kits volunteers can put together using a unit rate. This problem covers key mathematical concepts like proportions and multiplication, suitable for Grades 6-8.

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