Step $1.$ Each food tray is loaded with a packaged snack, a container with fruit, and a packet withplastic utensils. The process time of this step is $5$ seconds$/$tray$.$Step $2.$ Trays are shrink$-$wrapped in batches using a machine that requires asetup of $5$ secondsfor each tray. The batch size is $50$ trays per batch. After the set$-$up$,$ it takes $2$ minutes to shrink$-$wrap all trays in a batch at once, i$.$e$.,$ this is the case of simultaneous batching.Step $3.$ Each tray is placed in the airplane food cart, then loaded to the truck. The processingrate of this step is $10$ trays per minut