I know how to find the distance he covered, but I don't know how to find the displacement I know it's either 1 or 2
distance he covered = 3
The question should have stated where the displacement they wanted was from.
But it is fair to assume that they meant from the starting point.
The distance travelled is 3 km
He has finished 1 km due south of where he started so the (absolute value of the) displacement is 1.