Answer:
The actual distance is 30 miles
Explanation:
This can be solve using a rule of three, in which we know that 1/4 of an inch represents 2 miles, then, 3 3/4 of an inch, how many miles represent. This can be calculate as:
1/4 inch ---------------------- 2 miles
3 3/4 inch ------------------- X
Where X is the miles that represent 3 3/4 of an inch.
For solve for a X, we need to change the mixed number 3 3/4 into a rational. That is:

So, 3 3/4 on an inch is equivalent to 15/4 of an inch.
Then, Solving for X we get:




Finally, The actual distance of two cities separate 3 3/4 inches in the map is 30 miles