ok so, i have a problem.. it says: two trains have the eame length L=150m, are traveling in a parallel itinerary. the first is going with 60 km/s, the second 90km/s. 1) the trains are going in the oppsite way. how much time is it gonna take them to cross each other? 2) same question, but this time, they're going on the same way. well, for the first question: the first trrain is gonna take t=0.15/60 = 0.0025 hour to pass an immobile point outside the train. the second train is gonna take 0.0017hour. I just substracted 0.0025 - 0.0017 to get 0.0008 hour. and that's the time the crossing is gonna take. am i right?