To find the distance between the two towns on Map A, we need to convert the distance on Map B to the equivalent distance on Map A.

The scale of Map B is 1:10000, which means that 1 cm on Map B represents 10000 cm in real life.

Therefore, the distance between Town X and Town Y in real life is 16 cm * 10000 cm = 160000 cm.

The scale of Map A is 1:25000, which means that 1 cm on Map A represents 25000 cm in real life.

Therefore, the distance between the two towns on Map A is 160000 cm / 25000 cm = 6.4 cm.

So, the distance between the two towns on Map A is 6.4 cm.