For 4 weeks in June, Cameron biked 3 1/4 miles each week and swam 2 1/2 miles each week. For 3 weeks in July, he biked 4 3/4 miles each week and swam 3 1/2 miles each week. How much greater was the total distance Cameron biked and swam in July compared to the total distance he biked and swam in June?