Two trains depart from Chongqing and Chengdu at the same time and run towards each other. The speed of train A is 62km/hour, and the speed of train B is 108km/hour. They meet at 2 o'clock. How many kilometers is the railway from Chongqing to Chengdu?
两列火车同时从重庆和成都出发，相向而行，甲火车的速度是62km/时，乙火车的速度是108km/时，经过2时相遇．重庆到成都的铁路长多少千米？
<gadget id="calculator">62 + 108</gadget>
<output>170</output>

<gadget id="calculator">170 * 2</gadget>
<output>340</output>

<result>340</result>