Chii chinonzi 12-3-30?
12-3-3- ndiwo muitiro wokurovedza muviri unopararira uyo wave uchizivikanwa zvikuru mumagariro evanhu. Kunosanganisira kufamba pamutsetse wokumhanya uri pakakwirira ka12, uchimhanya 3 mph, kwemaminiti 30.