1. Two trains of equal length traveling in opposite directions pass a stationary pole in \( 18 \text{ s} \) and \( 12 \text{ s} \) respectively. How long will it take for them to completely cross each other?
A) \( 14.4 \text{ s} \)
B) \( 15 \text{ s} \)
C) \( 16.2 \text{ s} \)
D) \( 18.5 \text{ s} \)
Correct Answer: A
Detailed mathematical steps and logical reasoning.


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