The distance between A and B is 600 kilometers. The truck and the truck drive from the two places at the same time. After traveling for 3 hours, the ratio of the distance traveled to the remaining distance is 2:3. The truck and the truck still need to pass for a few hours. meet?
甲、乙两地相距600千米，卡车和货车同时从两地相向开出，行了3小时后，已行的路程与剩下路程的比是2：3，卡车和货车还需要经过几小时相遇？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">600 * (3/5)</gadget>
<output>360</output>

<gadget id="calculator">600 * (2/5)</gadget>
<output>240</output>

<gadget id="calculator">240 / 3</gadget>
<output>80</output>

<gadget id="calculator">360 / 80</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>