Correct Answer - Option 3 : 4 - 20 hours
It is given that the train arrived at 6-20 hours to the station and the train is already been late by 1-30 hours.
Now, if we reduce 1-30 hours from 6-20 hours we will get the exact scheduled time of the train.
Therefore, The scheduled time of the train is 4-50 hours.
Now, it is also given that the passenger was half an hour earlier than the scheduled time of the train.
reduce 30 minutes from 4-50 hours we will get the time of the passenger reached the station.
Therefore, the passenger reached the station at 4-20 hours.
Hence, the correct answer is 4-20 hours.