PLEASE!　　　　HELP　　　　　ME　　!　　　COME　ON　!（1）一座铁路桥全长1200米,一列火车开过大桥需花费75秒,火车开过路旁电杆,只要花费15秒,那么火车全长是多少米?（2）一人以每分钟120米

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