Two trains depart from two stations 320 kilometers apart at the same time. Car A travels 40 kilometers per hour, and the speed of train B is 1.5 times that of A. How long does it take for the two trains to meet?
两列火车分别从相距320千米的两站同时相对开出，甲车每小时行40千米，乙车速度是甲车的1.5倍，行了几小时两车相遇？
<gadget id="calculator">40 * 1.5</gadget>
<output>60</output>

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

<gadget id="calculator">320 / 100</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>