Two cars are driving from Abilene to DFW. The first car travels at 60 miles per hour it leaves Abilene 20 minutes before the second car. The second car travels 70 miles per hour how long will it take the second car to catch and pass the first car

Answer 1

20 min head start at 60 mph means 20 mi

the 2nd car catches up at 10 mph (70 - 60)

catch up time is ... 20 mi / 10 mph