Two trains depart from Beijing and Shenyang at the same time. It is known that train A travels 128 kilometers per hour and train B travels 132 kilometers per hour. The two trains meet each other in 3 hours. What is the total length of the railway from Beijing to Shenyang? km?
两列火车从北京、沈阳两站同时相对开出，已知甲车每小时行128千米，乙车每小时行132千米，两列火车3小时候相遇，求北京到沈阳的铁路全长多少千米？
<gadget id="calculator">128 + 132</gadget>
<output>260</output>

<gadget id="calculator">260 * 3</gadget>
<output>780</output>

<result>780</result>