A train of passenger cars and a train of freight trains depart from places A and B opposite each other at the same time. The speed of the passenger train is 85 km/h and the speed of the freight train is 65 km/h. The two trains meet after 12 hours. How long is the railway between A and B?
一列客车和一列货车同时从甲、乙两地相对开出．客车的速度是85千米/时，货车的速度是65千米/时，12小时后两列火车相遇．甲、乙两地间的铁路长多少千米？
<gadget id="calculator">85 + 65</gadget>
<output>150</output>

<gadget id="calculator">150 * 12</gadget>
<output>1_800</output>

<result>1_800</result>