A remote control car races straight down the street at 26 mi

A remote control car races straight down the street at 26 miles per hour. Two hours later, a second remote control car races straight down the same street at 52 miles per hour in pursuit of the first car. From the moment the first car started, how many hours will it take the second car to catch up to the first?

Solution

Car 1 is 52 miles away (26 mph * 2hr)
Car 2 gains on Car 1 at 26 mph (52 - 26)
52/26 = 2 hours to overtake Car 1
--> 4 hours from the time Car 1 passed