Final answer:
Rural Interstate speed limits can vary by state but can be as high as 75 miles per hour and sometimes up to 80 miles per hour. Conversions such as 100 km/h equaling approximately 62 miles per hour, and 1 m/s being 3.6 km/h or about 2.2 mi/h, are essential for understanding speed limit equivalence.
Step-by-step explanation:
The question concerns the maximal speed limit which may be encountered on rural Interstate highways in the United States. While the options provided are 65, 70, and 75 miles per hour, it's important to note that rural Interstate speed limits vary by state and can sometimes be higher than the options given. In certain states, the maximum posted speed limit can indeed be as high as 75 miles per hour, but it can also go up to 80 miles per hour, or approximately 129 kilometers per hour (km/h).
When comparing speed limits in different units, it's useful to remember that 1 mile is about 1.609 kilometers and thus, 100 km/h is equivalent to approximately 62 miles per hour. Furthermore, 1 meter per second (m/s) is precisely equal to 3.6 km/h, or roughly 2.2 miles per hour (mi/h). These conversions help in understanding the equivalence between different systems of measurement, such as the metric system and the United States customary system.