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David will finish first, because if you divide Brad's miles by 2 to his miles in a 1/4 of an hour are 5.95 miles. This means David went 6.2 miles in the same time that Brad went 5.95. Therefore, David will finish first.
Step 1: Find common denominators
LCM of 2 and 4 = 4
2 3/4 - 1 2/4
Step 2: Subtract
2 - 1 = 1
3/4 - 2/4 = 1/4
Answer: 1 1/4
Hope this helps!! :)