Final answer:
Approximately 7.08 labor hours are needed to staff the tray line.
Step-by-step explanation:
To calculate the labor hours needed to staff the tray line, we need to calculate the total number of meals served and then divide it by the rate at which the tray line produces meals.
Breakfast: 110 patients x 2 meals per minute = 220 meals
Lunch: 150 patients x 2 meals per minute = 300 meals
Dinner: 165 patients x 2 meals per minute = 330 meals
Total meals: 220 + 300 + 330 = 850 meals
Total time to produce meals: 850 meals / 2 meals per minute
= 425 minutes
Number of labor hours needed: 425 minutes / 60 minutes per hour
= 7.08 hours
Therefore, approximately 7.08 labor hours are needed to staff the tray line.