Two trains depart from A and B at the same time and run towards each other. The ordinary train travels 62 kilometers per hour, and the express train travels 108 kilometers per hour. They meet after 2 hours. How many kilometers are there between A and B?
两列火车同时从A、B两地出发，相向而行，普通列车每小时午62千米，特快列车每小时行108千米，经过2小时相遇．A、B两地相距多少千米？
<gadget id="calculator">62 * 2</gadget>
<output>124</output>

<gadget id="calculator">108 * 2</gadget>
<output>216</output>

<gadget id="calculator">124 + 216</gadget>
<output>340</output>

<result>340</result>