Answer for traveling cars

Question

Car A leaves at 8:00 a.m. at 40 mph. Car B leaves 2 hours later at 60 mph. How long does it take Car B to catch up to Car A?

Answer 1

Forty miles per hour times x hours is set equal to 60 miles per hour times (x-2) hours.

40x miles = 60(x-2) miles or 40x = 60x-120. This gives 120 = 20x or x = 6 (hours).