I just had two people take my order in a drive thru. They alternated every question. First person welcomed me and asked what I wanted. The next person asked what size and drink I wanted. The first person came back on and asked if I wanted any cheese sauce then the second person came back on and told me the price. When I got up to the window the 2nd person was the one working the register. This happens from time to time at different places when I get lunch but I can’t figure out why it is done.
So in the kitchen there will usually be several people wearing wireless headsets. They can all hear the drive through and each other.
So depending on how busy the place is, sometimes you’ll actually have the cook on the headset asking what you want while he’s making it, while the drive through person is handing out food to one group and typing your order in at the same time(for example).
Fast food work sucks
Also, parts of orders can be taken remotely and may not even be in the restaurant.