1. The problem statement, all variables and given/known data Two cars start from the same point at the same time, with one car traveling at a constant speed of 55 mph, and the other car having a constant speed of 70 mph. How far has the faster car travelled when it has a 15 minute lead on the slower car? Problems like this always throw me off.. I need help on the process of this problem. 2. Relevant equations 3. The attempt at a solution Not sure how to set it up really. I think I have to use D=r/t I also know the answer is in miles because it's distance, other than that I'm uncertain.