题目内容

OFFICE HOUR
I am becoming increasingly concerned about the punctuality of certain members of staff and would like to remind all staff that our office hours are from 9 a.m. till 4 : 30 p. m. ; morning and afternoon breaks are 15 minutes each, and the lunch break begins at 12 : 40 and ends at 1 : 30 p.m.
Please note that this time-table must be adhered to by all members of staff.
Mrs. Waters
Office Manager
21 Jan. 2010
How long can the staff rest during their working hours on workday？

A. 15 minutes
B. Half an hour
C. 50 minutes
D. One hour and twenty minutes

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