Mathematics, 02.09.2019 05:00, sissygirl0807

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a freight train left seoul and traveled north at an average speed of 15.6 km/h. a passenger train left 3.9 hours later and traveled in the same direction but with an average speed of 39 km/h. how long did the freight train travel before the passenger train caught up?
( and explain)

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And ! (asap)
a freight train left seoul and traveled north at an average speed of 15.6 km/h....