Q. A train X starts from A at 4 P.M. and reaches B at 5 P.M. while another train Y starts from B at 4 P.M. and reaches A, at 5.30 PM. The two trains will cross each other at ?

1. 4.36 pm
2. 4.48 pm
3. 4.52 pm
4. 4.56 pm