A passenger car and a truck leave opposite places A and B at the same time and meet each other 3 hours later. A truck travels 80 km per hour, and the speed ratio of the truck to the passenger car is 4:5. How many kilometers is the distance between A and B?
一辆客车和一辆货车同时从甲、乙两地相对开出，3小时后相遇．货车每小时行80km，货车与客车的速度比是4：5，甲、乙两地相距多少千米？
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 + 80</gadget>
<output>180</output>

<gadget id="calculator">180 * 3</gadget>
<output>540</output>

<result>540</result>