Final answer:
The speed limit in a NJ residential or business district is typically 30 miles per hour.
Step-by-step explanation:
The speed limit in a NJ residential or business district is typically 30 miles per hour. This speed limit is set to ensure the safety of pedestrians, cyclists, and motorists in areas with high levels of residential or commercial activity. The purpose of this speed limit is to minimize the risk of accidents and injuries in these areas.