You are on a train platform and a train, traveling at 10 mph, passes by you moving to the right. A person on that train is moving at -5 mph as they walk to the left through the train. How fast does the person, walking on the train, appear to be moving to you?   a. 0 mph to the left   b. 5 mph to the right   c. 10 mph to the left   d. 5 mph to the lef

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