This math topic focuses on calculating relative speeds, specifically the speed of a person relative to the ground while moving from the back to the front of a train. The problems on this topic involve determining this speed across various scenarios where the speed of the train and the distances covered by both the train and the person vary. Each question provides multiple choice answers to choose from. This set of problems is designed to enhance understanding of concepts involving speed, distance, and time within practical contexts.
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A person on a 140 m long train that is going 7 m/s walks from the back to the front while the train goes 245 m. What is the person's speed relative to the ground?