Answer:
The caterer should bring 30 gallons of tea.
Explanation:
During a catered lunch, an average of 4 cups of tea are poured per minute.
The lunch will last 2 hours.
1 hour = 60 minutes
2 hours = 60 × 2 = 120 minutes
in 120 minutes tea are poured = 4 × 120 = 480 cups
There are 16 cups = 1 gallon
480 cups =

= 30 gallons
The caterer should bring 30 gallons of tea.