The distance between A and B is 500 kilometers. The bus travels from A to B at 40 kilometers per hour. One hour later, the train travels from B to A at 60 kilometers per hour. How many hours did the truck meet the passenger car after departure?
甲乙相距500千米，客车从甲地开往乙地，每小时行40千米，1小时后，火车从乙地开往甲地，每小时行60千米，．货车出发后几小时与客车相遇？
<gadget id="calculator">40 * 1</gadget>
<output>40</output>

<gadget id="calculator">500 - 40</gadget>
<output>460</output>

<gadget id="calculator">40 + 60</gadget>
<output>100</output>

<gadget id="calculator">460 / 100</gadget>
<output>23/5 = around 4.6</output>

<result>23/5 = around 4.6</result>