Answer:
Increasing→ 0-20 minutes
Constant→ 20-35 minutes
Decreasing→ 35-50 minutes
After 15 minutes, he travelled 500 meters.
1. Time
0 - 20 minutes INCREASING
20 - 35 minutes CONSTANT
35 - 50 minutes DECREASING
2. After 15 minutes he travelled = 500 meters.
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