Box A has 12 balls and Box B has 8 balls.
OR
Box A has 60 balls and Box B has 40 balls.
OR
Box A has 48 balls and Box B has 32 balls.
The first one is A and then the next one I believe should be 210 for both
9.11 kilometers
18.5 - 0.28 = 18.22
18.22 / 2 = 9.11