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To determine the time it took per customer for each restaurant, we need to divide the total time by the number of customers for each restaurant.

Here’s the breakdown:

1. **First restaurant:**
   - Number of customers = 3
   - Time taken = 21 minutes
   - Time per customer = \( \frac{21}{3} = 7 \) minutes

2. **Second restaurant:**
   - Number of customers = 5
   - Time taken = 45 minutes
   - Time per customer = \( \frac{45}{5} = 9 \) minutes

3. **Third restaurant:**
   - Number of customers = 6
   - Time taken = 60 minutes
   - Time per customer = \( \frac{60}{6} = 10 \) minutes

Now, to find the fastest service, we compare the times per customer:
- First restaurant: 7 minutes
- Second restaurant: 9 minutes
- Third restaurant: 10 minutes

Therefore, the **first restaurant** served the fastest with **7 minutes per customer**.

Let me know if you'd like further details or explanations!

Here are 5 related questions you can explore:
1. What is the average time per customer across all three restaurants?
2. If the first restaurant served one more customer, how would that affect its average time per customer?
3. What would be the total time for the second restaurant to serve 8 customers at the current rate?
4. How much slower is the second restaurant compared to the first restaurant?
5. If the third restaurant reduced its service time by 10 minutes, what would be the new time per customer?

**Tip:** Dividing larger totals by the number of items (or customers) is a key way to determine averages, helping you compare efficiency across different situations.

Keiko owns three restaurants. The table below shows the number of customers served by each restaurant and how much time the total service took. Write the time it took per customer for each restaurant. Then determine which restaurant served the fastest.

Learn how to determine the time it took per customer for three restaurants and find out which served the fastest. The problem involves simple division and rate comparison, suitable for students in grades 5-6.

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