A car leaves town A at 100 pm traveling at 45 miles per hour

A car leaves town A at 1:00 pm traveling at 45 miles per hour. A second car leaves town A at 2:00 pm traveling the same route at 55 miles per hour. How long will it take the second car to overtake the first car?

overtake speed is 10 mph
A is 45 miles ahead
45/10=4.5 hrs