2. Two cars leave St. Louis from exactly the same spot at exactly the same time, one traveling west at 60 mph and the other traveling east at 40 mph. How long does it take before the cars are 180 miles apart?
A. 1 hour 18 minutes
B. 1 hour 28 minutes
C. 1 hour 38 minutes
D. 1 hour 48 minutes
E. 2 hours
