He won by a comfortable . 24 seconds , but after the race he expressed frustration with his time , 19.78 seconds .
Bolt won his third consecutive Olympic 200m gold medal in his last individual Olympic race .
Bolt won by a comfortable . 24 seconds , but after the race Bolt expressed frustration with Bolt 's time , 19.78 seconds .
Bolt won his third consecutive Olympic 200m gold medal in his last individual Olympic race .