Based on ABC inventory analysis: $20\%$ of items that cover $80\%$ of sales are A items; $40\%$ of the items that covers next $15\%$ of sales are B items; and remaining items that cover the remaining $5\%$ of sales are C items. Following warehouse is designed based on this analysis. Determine the distance an order picker travels at an average for one order. $($dimensions are in feet$)($Refer to pages $182-183$ in text..$\mathrm{.}204-205$ in $5$th Ed$)$