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Analysis of Junior High School Mathematics Test Questions and Answers
If the length of the first iron bridge is xm, then the length of the second iron bridge is 2x-50.

According to the meaning of the question

x/600+5/60=(2x-50)/600

x = 100

2x-50 = 150

The length of the first iron bridge is 100m, and the length of the second iron bridge is 150m.