Distance travelled by bus = 125.5 km
Distance travelled on pony = 14.25 km
Suppose the distance travelled on foot = x
Total distance = 150 km = Distance travelled by bus + distance travelled on pony + distance travelled on foot
150 km = 125.5 km + 14.25 km + x
150 km = 139.75 km + x
x = 150 km - 139.75 km
x= 10.25 km
Therefore, distance travelled on foot = 10.25 km