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The distance between two stations $\text{A}$ and $\text{B}$ is $450 \; \text{km}$. A train starts from $\text{A}$ and moves towards $\text{B}$ at an average speed of $15 \; \text{km/h} $. Another train starts from $\text{B, 20}$ minutes earlier than the train $\text{A}$, and moves towards $\text{A}$ at an average speed of $20 \; \text{km/h}$. How far from A will the two trains meet?

  1. $180 \; \text{km}$
  2. $320 \; \text{km}$
  3. $190 \; \text{km}$
  4. $260 \; \text{km}$
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