Question

Alexander is riding his bicycle to school. After one mile, he is a third of the way there. How much farther does he have to ride?

Answer 1

So here:
Basically the problem is saying

1 mile = 1/3

If this is changed into a "ratio", it becomes

1 mile = 1/3 : 3 miles = 3/3.

The answer is
Alexander needs to ride 3 more miles.

Answer 2

2 miles is how much farther he has to travel