The fourth period will start at 11:15 am
For given question,
Class starts at 9:00 am if each period last 40 min and are there five min between period.
This means, the next class would start after 45 minutes.
The first period will start at 9:00 am
The second period would be at,
9:00 + 45 minutes = 9:45 am
The third period would be at,
45 minutes after 9:45 am = 10:30 am
The fourth period would be at,
45 minutes after 10:30 am = 11:15 am
Therefore, the fourth period will start at 11:15 am
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