On September 8 , she won the 10,000 m final in a world record of 29 : 31.78 , which bettered the former record by 42 seconds .
Was also the first - ever sub-30 minute performance in this event .
On September 8 , she won the 10,000 m final in a world record of 29 : 31.78 , which bettered the former record by 42 seconds and was also the first - ever sub-30 minute performance in this event .