The distance between A and B is 300 kilometers. After the passenger car and the truck drive from the two places at the same time for 2 hours, the ratio of the remaining distance to the distance traveled is 3:2. How many hours will it take for the two cars to meet?
甲，乙两地相距300千米，客车和货车同时从两地相向开出行2小时后，余下的路程与已行的路程之比是3：2．两车还需要经过多少小时才相遇．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<result>3</result>