Final answer:
The speed limit in a marked school zone, during the hours that students are present, may be as low as 15 miles per hour.
Step-by-step explanation:
The subject of this question is Social Studies. In most places, the speed limit in a marked school zone during the hours that students are present is 15 miles per hour. This lower speed limit is implemented to ensure the safety of students who may be walking or biking to school.