Explanation:

- The two trains are moving towards each other, so their relative speed is the sum of their speeds: \(80 \, \text{km/h} + 120 \, \text{km/h} = 200 \, \text{km/h}\).

- They will meet when the distance between them is zero.

- 10 minutes is \(\frac{10}{60}\) hour, which is \(\frac{1}{6}\) hour.

- In 10 minutes, the trains cover a relative distance of \(\frac{1}{6} \times 200 = \frac{200}{6} = 33.33 \, \text{km}\).

- Therefore, 10 minutes before they cross each other, they are 33.33 km apart.

- Option 2 is the correct answer: 33.33 km.

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