Question

Christina's time for a race was 38.4 seconds. Another runner's time was 9.59 seconds faster. Write and evaluate an equation with a variable to find the difference between Christina's time and the other runner's time.

A. 38.4 + 9.59
B. 38.4 - 9.59
C. 38.4 X 9.59
D. 38.4 ÷ 9.59

Answer 1

To find the difference between Christina's time and the other runner's time, we use the equation 38.4 - 9.59, which gives us 28.81 seconds as the time for the other runner.

Step-by-step explanation:

The question asks us to find the difference in time between Christina's race and another runner who was 9.59 seconds faster. To find the difference, we subtract the amount of time the other runner was faster from Christina's time. Therefore, the correct equation to use is:

Christina's Time - Faster Runner's Advantage = Other Runner's Time

Which translates to:

B. 38.4 - 9.59

When we evaluate this equation, we get:

38.4 seconds - 9.59 seconds = 28.81 seconds

The other runner's time was 28.81 seconds, which is the difference between Christina's time and the other runner's time.