Answer:
Explanation:
To convert miles per hour to miles per minute, we need to divide the speed by 60 because there are 60 minutes in an hour.
So:
30 miles per hour = 0.5 miles per minute
50 miles per hour = 0.83 miles per minute
70 miles per hour = 1.17 miles per minute
Speed limits are typically posted in miles per hour because it is the most commonly used unit of measurement for speed in everyday life. Most people have a good understanding of what miles per hour means, and it is a convenient unit for measuring the speed of cars, which are typically designed to travel at speeds in the range of tens to hundreds of miles per hour.
Miles per minute or miles per second are less commonly used units of measurement for speed, and they may be less intuitive for people to understand. Additionally, they may be more appropriate for measuring the speed of objects that move at extremely high speeds, such as airplanes or spacecraft, rather than for everyday driving.
Overall, miles per hour is a widely recognized and convenient unit for measuring the speed of cars, which is why it is used as the standard unit for speed limits.