88. As shown in the figure, two people, A and B, are playing hide-and-seek outside a square wall with a side length of 100 meters. They start from two opposite corners at the same time and walk in a clockwise direction. A walks 50 meters per minute, and B walks 30 meters per minute. Both will stop for 1 minute when they reach a corner. Then, at least after $\qquad$ minutes, A can see B.
Reference answer: 8
Key point: Travel problem - Stop and go problem