A passenger train travels from station A to station B at a speed of 120 kilometers per hour, and at the same time a freight train travels from station B to station A at a speed of 100 kilometers per hour. After 5 hours, the two cars meet. How many kilometers is the length of the railway between A and B?
一列客车以每小时120千米的速度从甲站开往乙站，同时有一列货车以每小时100千米的速度从乙站开往甲站，经过5小时两车相遇．甲乙两站间的铁路长多少千米？
<gadget id="calculator">120 + 100</gadget>
<output>220</output>

<gadget id="calculator">220 * 5</gadget>
<output>1_100</output>

<result>1_100</result>