A train passes a tunnel 450 meters long in 45 s and passes a telegraph pole in 15 s. Determine the length of the train and its speed?

1) 45 – 15 = 30 (s) – time of passage of the bridge without regard to the length of the train
2) 450: 30 = 15 (m / s) – train speed
3) 15 ◦ 15 = 225 (m) – the length of the train
Answer: 15 m / s; 225 m.

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