When they meet, the total distance between them is twice that from A to B.

The time is 3 hours

So 3x+3(x-2)=2×25.5.

3x+3x-6=5 1

6x=57

x=9.5

x-2=7.5

A: A is 9.5 kilometers per hour and B is 7.5 kilometers per hour.