To determine the distance between two cars traveling at constant speeds after three hours, we need to know the speeds at which each car is traveling. Let's assume the speeds of Car A and Car B are given in miles per hour (mph).
If Car A is traveling at a speed of "v" mph and Car B is traveling at a speed of "u" mph, the distance traveled by Car A after three hours would be 3v miles, and the distance traveled by Car B after three hours would be 3u miles.
Therefore, the distance between the two cars after three hours would be:
Distance = 3v - 3u miles
This formula assumes that the two cars start at the same point and travel in the same direction. If they start from different points or travel in different directions, additional information would be needed to calculate the distance between them accurately.