The person on the conveyor belt is moving at 120 mph relative to the ground. This is because the person is running at 20 mph relative to the conveyor belt, and the conveyor belt is moving at 100 mph relative to the ground. Therefore, the person's total speed is the speed of the conveyor belt (100 mph) plus the speed of the person relative to the conveyor belt (20 mph), giving a total speed of 120 mph.
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