This math topic focuses on calculating the speed of a train based on the relative speed of a person walking from the back to the front of the train. The problems provide the length of the train, the time it takes for the person to walk from one end to the other, and the person's speed relative to the ground. Students are required to solve for the train's speed using these given values. This topic is part of an introductory unit on speed, distance, and time logic challenges.
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A person on a 120 m long train walks from the back to the front in 40 s. The person's speed relative to the ground is 9 m/s. How fast is the train going?