<prompt> Pedzisa mutsara unotevera: Akabatanidzwa muZhizha reOlympic ra1964 hafu yekupedzisira mumamita 200,  <response>: wechitanhatu mu 4 × 100 metres relay uye mu1968 Summer Olympics kupisa mumamita 400, wechishanu mu 4 × 100 metres relay. 