Final answer:
The students can have 415 minutes extra for each passing period if they have a 35-minute lunch.
Step-by-step explanation:
In order to calculate the extra minutes for each passing period, we need to subtract the lunch period duration from the total duration of the school day. If the school day is 7.5 hours (or 450 minutes) and the lunch period is 35 minutes, we can calculate the extra minutes as follows:
Total duration of the school day - Lunch period duration = Extra minutes for each passing period
450 minutes - 35 minutes = 415 minutes
Therefore, the students can have 415 minutes extra for each passing period.