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Ming is training for a
10K run. For each of her last 4 training runs, she reduced her time 2.5 minutes.
The following equation describes this situation:

4*(-2.5)=-10
What does -10 tell us?
Choose 1 answer:
(A) Ming's distance decreased a total of 10 kilometers.
(B) Ming's run time decreased a total of 10 minutes.
(c) Ming's run time increased a total of 10 minutes.

Ming is training for a $10 \mathrm{~K}$ run. For each of her last $4$ training runs, she reduced her time $2$ . $5$ minutes. $\newline$ The following equation describes this situation: $\newline$ $4 \cdot(-2.5)=-10$ $\newline$ What does $-10$ tell us? $\newline$ Choose $1$ answer: $\newline$ (A) Ming's distance decreased a total of $10$ kilometers. $\newline$ (B) Ming's run time decreased a total of $10$ minutes. $\newline$ (C) Ming's run time increased a total of $10$ minutes.

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Solve a system of equations using any method: word problems

Full solution

Q. Ming is training for a

10 \mathrm{~K}

run. For each of her last

4

training runs, she reduced her time

2

.

5

minutes.

\newline

The following equation describes this situation:

\newline

4 \cdot(-2.5)=-10

\newline

What does

-10

tell us?

\newline

Choose

1

answer:

\newline

(A) Ming's distance decreased a total of

10

kilometers.

\newline

(B) Ming's run time decreased a total of

10

minutes.

\newline

(C) Ming's run time increased a total of

10

minutes.

Calculate total reduction: Ming reduced her time by $2.5$ minutes for each of her last $4$ training runs, so we multiply $4$ by $-2.5$ to find the total reduction. $\newline$ $4 \times (-2.5) = -10$
Interpret result: The result of $-10$ indicates the total change in Ming's run time over the $4$ training runs.
Clarify unit of measurement: Since time is measured in minutes, the $-10$ represents a decrease in total time, not distance.
Final answer explanation: Therefore, the correct answer is (B) Ming's run time decreased a total of $10$ minutes.

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