Final answer:
The speed limit on rural freeways, unless otherwise posted, is usually 55 miles per hour (mph) in the United States. However, it is important to pay attention to posted signs when driving as speed limits can vary by state and country.
Step-by-step explanation:
The speed limit on rural freeways, unless otherwise posted, is usually 55 miles per hour (mph) in the United States. However, it is important to note that speed limits can vary by state and country, so it is always a good idea to pay attention to posted signs when driving. In the absence of any posted speed limit, always drive prudently and consider the road conditions and other factors that may affect your safety.