The results we derived for walk-and-pick systems are based on a P/D point located at the midpoint of the front of the warehouse. Assuming the traversal policy is used and that each pick is equally likely to be located anywhere in the warehouse, derive the expected walking distance per trip for the case where the P/D point is located at the lefthand side of the front of the warehouse (i.e., the P/D point is located at the lower lefthand corner of the warehouse). The number of aisles (M), the length (y) and width

(x) of the warehouse, and the number of picks per trip (n) are given and fixed.