Jack and Roberto were assigned to guard a tower. Each was to watch for 5 hours, then rest 5 hours while the other watched. If Roberto began his first watch at 6:00 p.m., at what time will he begin his third watch?
6+5=11pm(end of the 1st watch), then he will rest for 5 hours so 11+5=16(4am,end of rest), after that he will begin his 2nd watch so 4am+5h=9am(end of 2nd watch), then rest for 5 hours again so 9am+5h=14 or 2pm, then his 3rd watch is 2pm.
