SOLUTION: I need help with the following: A freight train leaves a station traveling 60 miles per hour. Thirty mintues later a passenger train leaves the station in the same direction on

Question 221563: I need help with the following:
A freight train leaves a station traveling 60 miles per hour. Thirty mintues later a passenger train leaves the station in the same direction on a parallel track at a speed of 72 miles per hour. How long will it take the passenger train to catch the freight train?
I either get 42 mintues or 75 minutes not sure.
Found 2 solutions by rfer, bagyo:
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
train A is 30 miles ahead of train B
B is overtaking A at 12 mph
30/12=2.5 hrs=2 hrs 30 min
Answer by bagyo(1) (Show Source): You can put this solution on YOUR website!
60*t = 72*(t-0.5)
12*t = 36
t = 3 hour
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