Your answer would be the third option, 65.
This is because if the car goes for 65mph for two hours, we can multiply 65 by two to get the miles travelled, which is 130. Now we can subtract this from 520 as that is the total distance, and get that there is 390 miles left to drive. If the whole trip takes 8 hours, and the car has already driven 2 hours, then the second part of the trip must be 8 - 2 = 6 hours. To get our final answer, we then divide 390 by 6 and get 65.
I hope this helps!
