round trip took 4 days, left on a wed. return on a wed how can this be

Question

solve math problem.  Passenger took a 4 day round trip to Mexico.  He left on a Wednesday, returning on a Wednesday,  How can this be?

Answer 1

The round trip took 4 days - two days to go and two days to return. The problem does not indicate for who many days he stayed. Passenger stayed still for three days (7 - 4)