The distance between A and B is 540 kilometers. A truck and a passenger car leave from A and B at the same time. It is known that the speed of the passenger car is 50 km/h, and the speed of the truck is (4/5) that of the passenger car. After the two cars leave, when will they meet?
甲乙两地相距540千米，一辆货车与一辆客车与同时从甲、乙两地相对开出，已知客车速度是50千米/小时，货车的速度是客车的(4/5)，求两车开出后，几时相遇？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 * (4/5)</gadget>
<output>40</output>

<gadget id="calculator">40 + 50</gadget>
<output>90</output>

<gadget id="calculator">540 / 90</gadget>
<output>6</output>

<result>6</result>