Answer:
45 miles
Explanation:
In the question it states that two-thirds of the way corresponds to 30 miles. It is obvious that you somehow need to break this down into thirds...
1/3 + 1/3 = 2/3
You want to know 1/3 + 1/3 + 1/3 because that correspondents to total length of his drive.
If 2/3 = 30, then you will 'understand' that half of that amount must be 1/3. You can 'see' that 1/3 must be half of 30, which is 15.
So check it again, and hopefully you now understand that this kind of question is easy once you break it down into the right fraction . So if you already thought to break this down into thirds, you are good to go.
1/3 + 1/3 + 1/3 = 15 + 15+ 15
The total length of his drive is 45 miles.