A passenger car and a truck travel towards each other at the same time from two cities A and B which are 440 kilometers apart. It is known that the passenger car travels 80 kilometers per hour and the truck travels 60 kilometers per hour. At 3 hours, did they meet? If we don't meet, how far is it?
客车和货车同时从相距440千米的甲乙两个城市相向而行，已知客车每小时行80千米，货车每小时行60千米．3小时时，它们相遇了吗？如果不相遇，还差多少路程？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">140 * 3</gadget>
<output>420</output>

<gadget id="calculator">440 - 420</gadget>
<output>20</output>

<result>20</result>