Help me if someone knows this please tell me!

The magnitude of the displacement the person traveled is 0.

Solution:

Starts driving and 3 km east to a store.

⇒ Distance = 3 km

Displacement = 3 km

Turns around and travels 1 km west to another store.

⇒ Distance = 1 km

Displacement = -1 km

Person travels 2 km west, back to the starting point.

⇒ Distance = 2 km

Displacement = -2 km

Magnitude of the displacement this person traveled

                    = 3 km + (-1 km) + (-2 km)

                    = 3 km - 1 km - 2 km

                    = 3 km - 3 km

                    = 0

The magnitude of the displacement the person traveled is 0.

ok then what happened.