On a​ map, 1 inch equals 10 miles. Two cities are 8 inches apart on the map. What is the actual distance between the​ cities?

If i have 20$ and i gave 5$ away how much i got

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

How can constraints be used to model a real-world situation?