You can't that's as simple you can get
Lines b and c
they both go up 2 and over 1 (rise over run is slope)
Solution
For this case we can create the following schema
We can use the definition of distance:
x= vt
We can find the relative velocity:

And the distance between both is required to be 2 mi so then we can find the time like this:

Then the answer is:
1 hr
Its is called A positive integer or a natural number.
87/62 = 1 and 25/62 (simplest form)