1. Solution: If a slow student walks X lanes per minute, an agile student walks (x+2) lanes per minute.

8x=6(x+2)

8x=6x+ 12

2x= 12

x=6

6 * 8 = 48 (Tao)

A: They have done 48 courses.

2.24(3.5+4.5)= 3 (hours)

After a three-hour meeting.