Two trains \( 120 \mathrm{~m} \) and \( 80 \mathrm{~m} \) in length are running in opposite dire...

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Two trains \( 120 \mathrm{~m} \) and \( 80 \mathrm{~m} \) in length are running in opposite directions with speds \( 42 \mathrm{~km} \) and \( 30 \mathrm{~km} / \mathrm{h} \). In what ime will they completely cross each other?
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