Answer:
Letters A, M, and T
Step-by-step explanation:
All of these letters have a point of symmetry.
Let 
be the speed of train A, and let's set the origin in the initial position of train A. The equations of motion are
where 
are the positions of trains A and B respectively, and t is the time in hours.
The two trains meet if and only if 
, and we know that this happens after two hours, i.e. at 
Solving this equation for v we have
So, train A is travelling at 105 km/h. This implies that train B travels at
The area is 4 square meters, because 2x2 would be 4
