Car A travels 40 kilometers per hour, and Car B travels 45 kilometers per hour. The two cars drive from the same place to the same direction at the same time. After 2 hours, Car B returns to the original place to pick up things and stays there for half an hour before chasing A. Car, ask how many kilometers away from the original place Car B catches up with Car A?
甲汽车每小时行驶40千米，乙汽车每小时行驶45千米，两汽车同时从同一地点向同一方向行驶，2小时后，乙汽车回原地取东西，并在原地停留半小时后追甲汽车，问乙汽车在距原地多少千米处追上甲汽车？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 0.5</gadget>
<output>4.5</output>

<gadget id="calculator">45 - 40</gadget>
<output>5</output>

<gadget id="calculator">4.5 / 5</gadget>
<output>0.9</output>

<gadget id="calculator">40 * 0.9 * 45</gadget>
<output>1_620</output>

<result>1_620</result>