A math problem

72 people were divided into 8 groups (winners in each group qualify), with 9 people in each group.

There are 8 venues, one as a team (this is just to look orderly. . )

The following is the arrangement of a group:

One person (marked as A) will be selected by drawing lots, and the remaining eight people will be eliminated and promoted. If there is a game of 15 minutes, there is only one player left in seven games (marked B), and then AB will play another game. A ***8 games, the time is 2 hours.

Eight groups compete in eight venues, so it doesn't matter.

Time to decide 8 winners: 2 hours.

After writing, I found that it should take (72-8) * 1 5/8 =120 minutes to destroy1person at a time.

In other words, if all the knockout rounds are played, the game for 8 people will take 2 hours, and the process will not affect = =.

Finally: only considering the time, it should be the fastest to play all the knockout rounds. But it's a bit unfair for players to play all the knockout rounds.