Correct option is C
Given:
The travel time between stations A and B is 39 hours.
Trains leave from A to B and B to A at 6 AM every day.
The service starts on Monday.
Solution:
Train travel time between stations A and B is 39 hours. Every day a pair of trains leave from A to B and B to A at 6 AM. The service starts on a Monday.
Train's travel time from station A to B and station B to A = Mon, 6 AM
Train's reach time to station A to B and station B to A = Tue, 9 PM
Now, again
Train's travel time from station A to B and station B to A = wed, 6 AM
Train's reach time to station A to B and station B to A = Thu, 9 PM
Now, the same train takes start the journeys again from their original stations and
Train's travel time from station A to B and station B to A = Friday, 6 AM
Hence, Option (c) is true.