The distance between the two places is 1320 kilometers. One train departs from place A and travels 48 kilometers per hour; the other train departs from place B and travels 72 kilometers per hour. How many hours did we meet?
两地相距1320千米，一列火车从甲地开出，每小时行48千米；另一列火车从乙地开出，每小时行72千米，两列火车同时开出，相向而行，经几小时相遇？
<gadget id="calculator">48 + 72</gadget>
<output>120</output>

<gadget id="calculator">1_320 / 120</gadget>
<output>11</output>

<result>11</result>