A train passes an $800 \text{ m}$ long bridge in $100 \text{ seconds}$ and a $400 \text{ m}$ long bridge in $60 \text{ seconds}$. What is the length of the train?
Options:
- A: $100 \text{ m}$
- B: $150 \text{ m}$
- C: $200 \text{ m}$
- D: $250 \text{ m}$
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