Given parameters:
First move = 100m east
Second move = 50m west
Unknown:
Distance = ?
Displacement = ?
Solution:
Distance is total path length covered
Displacement is the distance in a specific direction from start to finish.
-----------------------→
100m
←---------
50m
So,
Distance = first move + second move = 100 + 50 = 150m
Displacement = 100 - 50 = 50m due West