Rachael and Lisa are wimping laps to practice for their upcoming swim meet. They swim at the same constant rate but Rachael starts swimming before Lisa. When Lisa has finished 2 laps, Rachael has completed 4. How many laps has Rachel completed when Lisa has finished 8 laps.

The problem states that Rachael and Lisa swim at the same constant rate, but Rachael starts swimming before Lisa. When Lisa has completed 2 laps, Rachael has completed 4 laps. We need to determine how many laps Rachael has completed when Lisa finishes 8 laps.

We can solve this using a simple ratio.

1. When Lisa completes 2 laps, Rachael completes 4 laps. So, the ratio of Rachael's laps to Lisa's laps is:
   \[
   \frac{\text{Rachael's laps}}{\text{Lisa's laps}} = \frac{4}{2} = 2
   \]
   This means Rachael completes 2 laps for every 1 lap Lisa completes.

2. Now, when Lisa has completed 8 laps, we use the ratio of 2:1 to find how many laps Rachael has completed:
   \[
   \text{Rachael's laps} = 2 \times \text{Lisa's laps} = 2 \times 8 = 16
   \]

So, when Lisa has finished 8 laps, Rachael has completed 16 laps.

Would you like more details or have any questions? Here are 5 related questions:

1. What if Rachael swims at a faster rate than Lisa?
2. How would the problem change if Lisa started first?
3. What if the ratio of laps completed by Rachael to Lisa was 3:2 instead of 2:1?
4. How can we represent this scenario graphically?
5. Can we express the relationship between their laps using an equation?

**Tip:** When dealing with constant rates, using ratios is a quick way to solve comparative problems.

Rachael and Lisa are wimping laps to practice for their upcoming swim meet. They swim at the same constant rate but Rachael starts swimming before Lisa. When Lisa has finished 2 laps, Rachael has completed 4. How many laps has Rachael completed when Lisa has finished 8 laps?

Solve a ratio problem where Rachael and Lisa swim laps at the same constant rate, but Rachael starts earlier. When Lisa completes 2 laps, Rachael completes 4. Discover how many laps Rachael finishes when Lisa has completed 8 laps. This problem uses proportional reasoning and ratio concepts, ideal for students in Grades 5-7.

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