Two identical trains take \( 3 \mathrm{sec} \) to pass one another when going in the opposite di....

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Two identical trains take \( 3 \mathrm{sec} \) to pass one another when going in the opposite direction but only \( 2.5 \mathrm{sec} \) if the speed of one is increased by \( 50 \% \). Find the time
\( \mathrm{P} \)
(in sec) one would take to pass the other when going in the same direction at their original speed.


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