1. A train is moving at a speed of 65.0 mi/h. The ticket collector is walking 2.00 mi/h toward the front of the train. How fast is the ticket collector moving from the point of view of a person on the train?

2. How fast is the ticket collector in Problem 1 moving relative to an observer on the side of the tracks?

3. The ticket collector in Problem 1 turns around and walks toward the rear of the train at 2.00 mi/h. How fast is he walking relative to an observer on the side of the tracks?