The distance between A and B is 660 kilometers. Two trains leave opposite to each other at the same time. Train A travels 60 kilometers per hour, and train B travels 72 kilometers per hour. After how many hours, the two trains meet on the way? (column equation solution)
甲乙两地相距660千米，两列火车同时从两地相对开出，甲列火车每小时行60千米，乙列火车每小时行72千米，经过几小时两车在途中相遇？(列方程解答)
<gadget id="calculator">60 + 72</gadget>
<output>132</output>

<gadget id="calculator">660 / 132</gadget>
<output>5</output>

<result>5</result>