A train crosses two men walking in the same direction in which the train is going, at speeds of $18 \text{ km/h}$ and $36 \text{ km/h}$ in $10 \text{ s}$ and $15 \text{ s}$ respectively. Find the length of the train.
Options:
- A: $100 \text{ m}$
- B: $120 \text{ m}$
- C: $150 \text{ m}$
- D: $180 \text{ m}$
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