Final answer:
The speed limit in a school zone before and after opening and closing is typically around 31 miles per hour, designed to protect children and pedestrians during peak times.
Step-by-step explanation:
The speed limit in a school zone 45 minutes before and after opening and closing is typically lower than the standard limit to ensure the safety of children and pedestrians. While it may vary by location, a common residential area speed limit is about 50 kilometers per hour, which is approximately 31 miles per hour. This reduced speed helps to prevent accidents during times when children are likely to be entering or leaving the school premises.