Answer:
1.2 km
Explanation:
You want to know the distance on the ground if it is 12 cm on a map with scale 1:10,000.
Scale factor
The map scale is ...
map distance / distance on ground = 1 : 10000 = 12 cm : 120000 cm
Unit conversion
The 1 cm corresponds to 10^-5 km, so the ground distance is ...
120000 cm × 10^-5 km/cm = 1.2 km
The actual path is 1.2 km long.