This math topic focuses on calculating the length of a train that fully passes a platform at a given speed within a specified time. It involves problems related to the concepts of speed, distance, and time. The exercises require estimating the total distance traveled by the train, which includes both the train's length and the length of the platform, using the given speed and time. The resultant distance is then used to solve for the train's length by subtracting the platform's length. The problems are set up as multiple-choice questions, each with four possible answers.
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A train going 14 m/s fully passes a 40 m platform in 15 s. How long is the train?