Solution: If the distance between two villages is X kilometers, the planned speed is x/5.5 (km/h).

The equation is: (x-4.8)/(x/5.5)+4.8/[(1-25%) * (x/5.5)] = 5.5+12/60.

Namely: 5.5 (x-4.8)/x+[4 * (5.5) * 4.8]/(3x) = 5.7.

3 * 5.5 (x-4.8)+4 * (5.5) * 4.8 = 5.7 * (3 times)

16.5 x-79.2+ 105.6 = 17. 1x

So, 0.6x=26.4

So, x=44.

The distance between the two villages is 44 kilometers.