Answer:
the night security guard should travel to the next site at 4:05 am.
Explanation:
The guard arrives at a site at 3:25 am. Since they are scheduled to move to a different location every 40 minutes, we can add 40 minutes to the current time to find out when they should travel to the next site.
Adding 40 minutes to 3:25 am, we get:
3:25 am + 40 minutes = 4:05 am