2.5x+ 1.6y=36

Because they walked 36km at the same time when they met, 1.6y/x=2.5x/y, that is, 16y 2 = 25x 2, so 4y=5x.

Two types at the same time, x=8, y= 10.

So the speed A is 8 km/h and the speed B is 10 km/h. 。