Answer:
He swam 1/2 mile more and biked 1 1/4 mile more in July
Explanation:
June -- Bike 4 * ( 3 1/4) = 13 miles
Swim 4 * (2 1/2) = 10 miles
July -- Bike 3 * (4 3/4) = 14 1/4 miles
Swim 3 * (3 1/2) = 10 1/2 miles
14 1/4 - 13 = 1 1/4
10 1/2 - 10 = 1/2