First of all, you want the distance before the gas stop, so you need to subtract the 65 1/4 miles by the total since you don’t need that, which is
306 3/4 miles.
Since you wanna work backwards to find the answer, you have to divide by 3 since, just like the first part, you want the distance of the first part of the road trip, not the other parts (if that makes sense).
306 3/4 divided by 3 is your answer, which is
102 1/4 miles
