A car and a truck are traveling towards each other at the same time from two places 800 kilometers apart and meet at a distance of 40 kilometers from the midpoint. It is known that the truck travels 40 kilometers per hour, how many hours will the two vehicles meet?
小汽车和卡车从相距800千米的两地同时相向而行，在离中点40千米的地方相遇．已知卡车每小时行40千米，两车几小时相遇？
<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">800 + 80</gadget>
<output>880</output>

<gadget id="calculator">880 / 2 / 40</gadget>
<output>11</output>

<result>11</result>