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Junior high school mathematics 15 minutes
Let's just say that the distance to the park is 60 meters.

Then the father's speed is 2m/min and the son's speed is 3m/min.

At this time, Dad walked five minutes first, so Dad walked five * 2 5*2= 10/0 meters first.

Then every minute, the son walks more than the father 1 meter.

So it takes101=10 minutes for a son to catch up with his father.

Choose C.