Train A and Train B are traveling in the same directions on pararrel tracks. train a is traveling at 100mph?

unknown: Train A and Train B are traveling in the same directions on pararrel tracks. train a is traveling at 100mph?
and train b is at 110 mph.Train a passes a station at 8:20 pm. If train b passes that same station at 8:32 pm what time will train b catch up to train a?

Answers and Views:

Answer by Captain Matticus, LandPiratesInc
a(x) = 100 * (x + 12) = 100x + 1200
b(x) = 110x

a(x) = b(x)

100x + 1200 = 110x
1200 = 10x
120 = x

Train b will catch up with train a 120 minutes after train b passes the station, or 10:32 pm