A woman while shopping in a mall pushes her trolley starting from point S 20 metres through an alley which is going East up until T, then she turns to her left and walks 30 metres towards north, then she turns West and walks another 30 metres to reach V, then she turns South and walks 30 metres and to W, finally she turns West and walks 25 metres to stop at point X.
∴ Now she is 35 m west with reference to her starting position.