Solution: Let Xiao Li's speed be x m/min and Xiao Zhang's speed be y m/min.

If they start from point A at the same time, it will take 1.2 minutes to meet. That is, Xiao Zhang and Xiao 600 meters. 1.2X+ 1.2Y=600

If you drive in the same direction, it will take Xiao Li 3 minutes to catch up with Xiao Zhang. That is, Xiao Li ran 600 meters more than Xiao Zhang.

3X-3Y=600

Solution: x = 350m/min, y = 150m/min.

A: Xiao Li's speed is 350m/min, and Xiao Zhang's speed is 150m/min.

Xiao Li: 600 ≈ 350 ≈1.7 minutes,

Xiao Zhang: 600 \ 150 = 4 minutes

A: It takes about 1.7 minutes for Xiao Li to circle the circular runway, and 4 minutes for Xiao Zhang to circle the circular runway.

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