40 mph
50
In most countries, on most roads, there is no minimum.
The posted speed limit is the max speed.
Most that I am familiar with have a maximum of 65 mph and a minimum of 45 mph. In Ky & Tenn the speed limit is 70 mph on most Interstates and Parkways. There are exceptions so watch for posted speeds.
The minimum speed on major routes (if any) varies by state. As an example, in many jurisdictions the minimum speed on a 65 MPH Interstate is 45MPH. Most states have a catch-all rule that states you can be ticketed for driving at any speed that is so slow as to impede the flow of traffic.
B.
Whatever the posted speed limit is +or- 5 mph.
The maximum speed limit in Florida is 55 mph, except where otherwise posted. Speed limits are 70 mph on some rural interstate highways.
55 on the highway, and 30 in the city.
25 MPH or as posted.
On secondary roads, if the speed is not posted, it is generally 55 mph.
The best answer for this is: Where its posted at 25 mph There are certain school and residential zones that are posted at 25mph
It is posted.