Jennifer drove 130 miles in 2.5 hours. Which equation can be used to calculate r, the average speed at which Jennifer drove?

 
A.r=1302.5

B.130=r2.5

C.r = 130 – 2.5
D.130 = r + 2.5

The correct equation to calculate Jennifer's average speed \( r \) is based on the formula:

\[
\text{Speed} = \frac{\text{Distance}}{\text{Time}}
\]

In this case:
- Distance = 130 miles
- Time = 2.5 hours

Thus, the equation that can be used to calculate \( r \) is:

\[
r = \frac{130}{2.5}
\]

This matches **option A: \( r = \frac{130}{2.5} \)**.

Would you like further explanation on this? Here are some related questions:

1. How do you calculate average speed if time is given in minutes?
2. What units are used for speed when time is in hours?
3. How do you solve for time if speed and distance are given?
4. What is the difference between instantaneous speed and average speed?
5. How does the formula for speed apply in non-linear motion?

**Tip**: Always make sure units for distance and time are consistent when calculating speed.

Jennifer drove 130 miles in 2.5 hours. Which equation can be used to calculate r, the average speed at which Jennifer drove?

Learn how to calculate Jennifer's average speed using the formula Speed = Distance / Time. This example involves driving 130 miles in 2.5 hours and covers key algebraic concepts. Suitable for students in Grades 6-8.

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