The distance between A and B is 300 kilometers. The bus travels from A to B at 40 kilometers per hour. One hour later, the truck travels from B to A at 60 kilometers per hour. How long does it take for the truck to leave? Then meet the bus?
甲、乙两地相距300千米，客车从甲地开往乙地，每小时行40千米，1小时后，货车从乙地开往甲地，每小时行60千米，货车出发几小时后与客车相遇？
<gadget id="calculator">300 - 40</gadget>
<output>260</output>

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

<gadget id="calculator">260 / 100</gadget>
<output>13/5 = around 2.6</output>

<result>13/5 = around 2.6</result>