If the sailors left at 8 a.m. and the trip took 15 hours, you can find the arrival time by adding 15 hours to the departure time.
Starting from 8 a.m.:
- 8 a.m. + 12 hours = 8 p.m. (after 12 hours)
- Then, add the remaining 3 hours:
- 8 p.m. + 3 hours = 11 p.m.
So, the sailors arrived at their destination at 11 p.m.