1532 ÷ 36 = 42 and remain 20.
So there were 20 CDS in the remains box
-30 is the answer to your problem.
First, we count how far reached the Nell:
3,5 * 16 = 56 miles
Secondly, we count how far reached the Kristin:
3,5 * 18 = 63 miles
Now we expect the difference in the distance between them:
63 - 56 = 7 miles
The results that Kristin about seven miles driven more than Nell.
Answer: 3^5 / 3^(-2) = 3^(3)