Play reasoning with Wu Hao Round 2-ant Crawler

Problem:There is a 27 cm-long fine wooden pole. There is an ant in each of the five positions on the fifth, 3 cm, 7 cm, 11 cm, 17 cm, and 23 cm. The wooden pole is very fine, you cannot use two ants at the same time. At the beginning, the head of the ant is arbitrary to the left or right. They only move forward or turn around, but do not move back. When the two ants meet each other, at the same time, the ant will turn around and go in the opposite direction, assuming that the ant can walk 1 cm away every second. Find the minimum and maximum time for all ants to leave the wooden pole.