First, we need to transform the mixed number into a fraction using the following expression:

So, 6 1/4 mile is equivalent to:

Then, we need to remember how to divide two fractions, so:

Now, to calculate the number of miles that Jonathn will run, we need to divide the total number of miles (25/4 miles) by 5 friends, then:

Therefore, Jonathan will run 5/4 miles
Answer: 5/4 miles