SOLUTION: A train leaves the station traveling west at a constant rate of 45 mph. An express train leaves the same station 1 hour later heading west on the same route, traveling at a constan

Question 824218: A train leaves the station traveling west at a constant rate of 45 mph. An express train leaves the same station 1 hour later heading west on the same route, traveling at a constant rate of 60 mph. How many hours will the first train have been traveling when the express train catches up to it?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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head start trainA:
s = d / t
d = s * t
d = 45 * 1
d = 45 miles
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relative speed:
60 - 45 = 15 mph
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time to the meeting, after trainB departs:
t = d / s
t = 45/15
t = 3
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answer:
trainA will have been traveling 4 hours when trainB catches up
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