Question 452348
Trains A and B are traveling the same direction on parrarel lines. Train A is traveling 100 mph and train B is traveling 120 mph. Train A passes the station at 5:25 am and train B passes station at 5:37 am, what time will train B catch up with train A?
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The relative speed of the two trains is 120 - 100 = 20 mph
Train A has a 12 min. head start. In that time train A traveled 100 mph * 1/5 hr = 20 miles
Since the relative speed is 20 mph, if train A were standing still train B would 
approach train A at 20 mph.  The time required to travel 20 miles at 20 mph is:
20 mi/20 mi/hr = 1 hr.
So they meet at 6:37 am