Hi,

Let t represent the total time the train traveling 50mph takes before the

second train catches up.  (t-3) would represent the time for the second train

Distances for each train are the same.

r*t=d ****

50mph*t = 65mph(t-3)

50mph*t = 65mph*t - 3*65mph

3*65mph = 15mph*t

3*65mph/15mph = 13hrs, the time the first train travels

Second train travels for 10hrs   (13hr-3hr)



checking our answer

50*13 = 650= 65*10 

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