The total length of a railway bridge is 1200 meters, and it takes 75 seconds for a train to cross the bridge; it takes only 15 seconds for a train to cross the roadside poles, so the total length of the train is 1200 meters______ Rice

75-15 = 60 (s), train speed: 1200 △ 60 = 20 (M / s), train length: 20 × 15 = 300 (m)

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