The answer is 3.
First do 25 - 10 and you get 15
The final step is to do 15 divided by 5 and you get the final answer which is 3.
The directions of travel are at right angles to each other, so the Pythagorean theorem can be used to find the straight-line distance to the starting point. That distance (d) satisfies ...
d² = 65² +102²
d = √(4225 +10404) = √14629 ≈ 120.95
The appropriate choice is ...
... c. 121 miles
27.928cm² the process is shown in the following picture
