Answer Happy

A train of proper length 5 years passed by a very long train station with the speed B=%s. At the front and end of the train, there are 2 synchronized clocks facing the train station. Along the rails on the ground, there are observers with synchronized clocks. When the end of the train reaches an observer on the ground with coordinate x=0, that same observer takes a picture of the clock on the train, which shows the time t=0. We will call this event A. At exactly the same time, an observer takes a picture of the clock on the front of the train. We will call this event B. On the train, there is another observer at the front of the train, who takes a picture of the clock on the ground at exactly the same time when according to him the end of the train is at (t', x') = (0,0). We will call this event C. 1) What time does the observer on the ground see in his picture of the clock on the front of the train? (Event B) 2) What time does the observer on the train see in his picture of the clock on the ground? (Event C)