How many Priests left the precinct at 18:00 hrs?
Cannot be determined
Cannot be determined
If at 14:00 hrs 1 staff member and no priest entered, then no priest left (after 4 hrs) at 18:00 hrs.
1 devotee who entered at 16:00 hrs might have left at 17:00 hrs (after 1 hr) or at 18:00 hrs (after 2 hrs).
Then, 1 priest left at 18:00 hrs (after 4 hrs) or no staff member left at 18:00 hrs (after 4 hrs). Hence, the result cannot be determined.