This math topic focuses on calculating the speed of a train based on a person's movement within it. It involves problems where a person walks from the back to the front of a train and the person's ground speed is known, along with the time taken for the walk and the train's length. Students are tasked with determining the train's speed. Each problem provides multiple-choice answers, allowing students to apply concepts of speed, distance, and time to solve real-world relative motion problems.
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A person on a 90 m long train walks from the back to the front in 10 s. The person's speed relative to the ground is 15 m/s. How fast is the train going?