This math topic involves solving problems related to the concept of speed, distance, and time. Specifically, it focuses on scenarios where a train passes a platform at a certain speed and within a given amount of time, and students are required to calculate the length of the train. The exercises require an understanding of how to apply the formula relating speed, distance, and time to find the missing variable, which in this case is the train's length. Each problem provides multiple-choice answers, enhancing the learner's problem-solving skills in practical and real-world contexts.
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A train going 5 m/s fully passes a 40 m platform in 20 s. How long is the train?