Chapter 3, Problem 3.44P

Why is the following situation impossible? A shopper pushing a cart through a market follows directions to the canned goods and moves through a displacement $8.00\hat{i}\text{m}$ down one aisle. He then makes a 90.0° turn and moves 3.00 m along the y axis. He then makes another 90.0° turn and moves 4.00 m along the x axis. Every shopper who follows these directions correctly ends up 5.00 m from the starting point.