Hi bhavukchawla
Say a train starts from Amristar on Monday so acc to the given question it reaches on
Thursday
Now from Delhi sequence of trains are as follows .
STARTED REACHES SEQUENCE IN WHICH TRIANS MEET
1) Monday Thursday 4
2) Tuesday Friday 5
3) Wed Sat 6
4) Thursday Sun 7
5) Friday Monday 1
6) Sat Tuesday 2
7) Sun Wed 3
In above table 5 6 7 trains started from Delhi before the train starts from Amristar.(i.e last friday sat and sun).
If any thing wrong in my approach plz say me .