SOLUTION: if one train leaves the station going 80mph and 3 hours later another train going at 100mph leaves the same exact station going the same direction on parallel tracks, what time wil

Question 514714: if one train leaves the station going 80mph and 3 hours later another train going at 100mph leaves the same exact station going the same direction on parallel tracks, what time will the second train catch up?

Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
if one train leaves the station going 80mph and 3 hours later another train going at 100mph leaves the same exact station going the same direction on parallel tracks, what time will the second train catch up?
:
Actually you can do this in your head
;
After 3 hrs the 1st train will be 3*80=240 mi ahead of the second.
The relative speed between the two trains is 100-80 = 20 mph
How long will it take to travel 240 mi at 20 mph? 12 hrs, right
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