Two trains start from two different stations A and B. One is going from station A to station B and another from station B to station A. If first train takes 8 hours to complete the journey and the second one takes 12 hours, when do the two trains cross each other?**Answer**

The first and second train travel 1/8 and 1/12 respectively of the total distance of AB in one hour . So they cover 1/8 +1/12=5/24 of the distance AB in one hour. That means they will cross each other after 24/5 (4 hours 48 minutes) hours.

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This problem is supposed to be for high school students. Since it is not mentioning about a varying speed , acceleration ,etc, etc, we suppose they are constant. I don't think somebody will bother about the stops as well, since it is not mentioned. They will take this only as a matter of a simple problem and use their common sense.