Two trains of lengths $200 \text{ m}$ and $300 \text{ m}$ are running in opposite directions on parallel tracks at speeds of $54 \text{ km/h}$ and $36 \text{ km/h}$ respectively. In what time will they cross each other?

Options:

• A: $15 \text{ s}$
• B: $20 \text{ s}$
• C: $25 \text{ s}$
• D: $30 \text{ s}$

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