Analysis: 1 person already knows that he notified two people ten minutes ago, and the number of people conveyed at this time is three.

In the second round, three people will notify two people respectively, so six people will be notified in the twentieth minute, and the number of people conveyed at this time is nine.

In the third round, 9 people will notify 2 people respectively, so notify 18 people in the 30th minute. At this time, the number of people transported is 18+9=27.

……

In the first round A, the number of people transported is 3n(3 to the power of a), so the number of people transported in the sixth ten minutes is 3 6 = 729.

This is a primary school student's problem. . ?