If the annual meeting of the school district for other business is to be held at some other time than at the town meeting the school board shall post the warrant for said annual meeting omitting the article relative to election of district officers. The school warrant for the election of district officers shall prescribe the time the polls are to open and also an hour before which the polls may not close. Said prescribed times shall be the same as those set for the opening and closing of polls for the town meeting.