BAKKAL employs a random storage policy and uses standard 1m x 1m x 1 m pallets that are stored onto conventional two row racks and transported by means of reach trucks. Each rack has six shelves, each of which can store a single pallet and occupies 1.5 m x 1.5m area. Racks are arranged as in the figure below, where side aisles are 3 m wide, while the central aisle is 6 m wide. The average speed of a reach truck is 10 km/h. What is the optimal dimensions of the storage that minimizes average order picking time?
