Answer:
B) -3
Step-by-step explanation:
The coefficient is the numerical value placed before and multiplying the variable (x).
Step-by-step explanation:

You take 8 of something and add 2 more making 10 of something.
For this, we use the given info plus a bit of multiplying and subtraction
part 1)
we know that she's 25 y/m
so 5 minutes simply means 25 × 5

now we simply subtract this from 1000 (the original distance)

part 2)
the total time taken is even easier to find
all we have to do is divide 1000 by 25