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To solve this problem, we need to find how long it will take Danni to complete a 600-meter race if she drives at the same rate as when she completed the 400-meter race in 5 seconds.

### Step-by-step solution:

1. **Calculate the rate (speed):**
   - Danni drives 400 meters in 5 seconds.
   - Speed = Distance / Time
   \[
   \text{Speed} = \frac{400 \, \text{meters}}{5 \, \text{seconds}} = 80 \, \text{meters per second}
   \]

2. **Apply the same speed to the 600-meter distance:**
   - Time = Distance / Speed
   \[
   \text{Time} = \frac{600 \, \text{meters}}{80 \, \text{meters per second}} = 7.5 \, \text{seconds}
   \]

Thus, Danni will complete the 600-meter race in **7.5 seconds**.

### Answer:
The correct answer is **7.5 seconds**.

Would you like more details or have any questions?

Here are 5 related questions to further explore:
1. What would be Danni's time for an 800-meter race at the same speed?
2. How far would Danni travel in 10 seconds at her current speed?
3. If Danni drove for 15 seconds at the same rate, how far would she go?
4. What is Danni's speed in kilometers per hour (km/h)?
5. How much time would Danni save in a 600-meter race if her speed increased by 20%?

**Tip:** Always remember that speed is the rate of change of distance with time, and you can use the relationship \( \text{Speed} = \frac{\text{Distance}}{\text{Time}} \) to solve many similar problems!

Danni races cars at her local racetrack. She drove her red car 400 meters in 5 seconds. If she drives the same car at the same rate, how fast will she be able to complete a race that is 600 meters?

Learn how to calculate the time it takes for Danni to complete a 600-meter race given her speed from a 400-meter race in 5 seconds. This problem demonstrates key concepts like speed, distance, and time relationships. Suitable for students in Grades 6-8.

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