skip to level 4 then

It takes 5 hours to get between point A and point B by train, either direction. Trains leave from point A and head towards point B every hour on the hour. The same for trains going the other way - every hour on the hour, a train leaves from point B and goes towards point A.

Now if you were a passenger on one of these trains, you'd see a train pulling into the station just as you were leaving. 5 hours later, you'd see a train pulling out from the station and going the other way just as you arrive at your destination.

The question is, during these 5 hours, not counting the train you saw just as you were leaving, and not counting the one that pulls out when you arrive, how many trains would you meet going the opposite way?

(NO dirty trick questions, the tracks are pretty close to each other)