Answer:
Monday 4:40 p.m. to Tuesday 4:40 p.m.: 24 hours
Tuesday 4:40 p.m. to Wednesday 4:40 p.m.: 24h
Wednesday 4:40 p.m. to midnight: journey lasts 7:20 hours
from Wednesday midnight to Thursday 12:30 p.m. there is a 12:30 hour journey
total time: 24h+24h+7h20+12h30= 67h50min
Explanation: