Final answer:
The speed limit for cars in a residential area, unless otherwise posted, is usually 30 miles per hour.
Step-by-step explanation:
The speed limit for cars in a residential area, unless otherwise posted, is usually 30 miles per hour. This speed limit is set to ensure the safety of pedestrians and residents in the neighborhood. Driving at a lower speed in residential areas reduces the risk of accidents and provides more time to react to unexpected situations.
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