Final answer:
To have 2 people in the drive-thru, at a minimum, there must be 2 on shift, but additional staff may be required depending on other tasks that need to be addressed simultaneously.
Step-by-step explanation:
The minimum number of people required to be on a shift for 2 people to be in the drive-thru depends on the specific business's needs and staffing requirements.
If we assume that the only task for the shift is managing the drive-thru, and it requires 2 people to operate efficiently, then the minimum number would be exactly 2.However, if there are additional tasks such as customer service inside the store, preparing food, or managing payments, then more staff members would be necessary on that shift. Businesses often conduct a staffing analysis to determine the optimal number of employees needed per shift to balance labor costs with customer service quality.