Question

A car leaves town traveling 40 mi/h. Two hours later, a second car leaves the same town, on the same road, traveling at 60 mi/h. In how many hours will the second car pass the first car? Use formula d=rt

Answer 1

Don't really know how to use that formula, but the second car will past the first after 4 hours. 
1      240 = 40(6) 
2      240 =60(4)

First car has a "t" of 6, because the second car traveled two hours later.