Alright let’s go step by step for this:
1.) 6 1/4 - 1 1/4 = 5
2.) If he can run 1 1/4 miles before needing a break you would have to divide that number into the subtracted number from above
5 ÷ 1 1/4
3.) simplify the equation
5 ÷ 1.25
4.) Then divide
5 ÷ 1.25 = 4
Hope this helped!