Time for motion or answer. Respondent shall, within 20 days from the date of personal

service or mailing of a petition for judicial review under Iowa Code section 17A.19(2), serve upon petitioner and all others upon whom the petition is required to be served, and within a reasonable time thereafter file a motion or answer. [Report 1980; amendment 1984; Report April 30, 1987, effective July 1, 1987; November 9, 2001, effective February 15, 2002]