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The answer to the sixth question "Exploration and Thinking" on page P83 of the eighth grade mathematics evaluation manual.
1. Relationship between distance and time

2.BC is 250 meters away from the starting point and stays for 5 minutes.

Point A means 10 minutes to 450 meters.

Point D means start 16 minutes, and return to the starting point.

3. Make up one for yourself, what Xiaoming forgot to bring something halfway and ran back.

(Pay attention to time and distance)