A passenger car travels from station A to station B at a speed of 52 kilometers per hour, while a freight train travels from station B to station A at a speed of 42 kilometers per hour. After 3.5 hours, the two cars meet. How many kilometers is the length of the railway between A and B?
一列客车以每小时行52千米的速度从甲站开往乙站，同时有一列货车以每小时42千米的速度从乙站开往甲站，经过3.5小时两车相遇．甲乙两站之间的铁路长多少千米？
<gadget id="calculator">52 + 42</gadget>
<output>94</output>

<gadget id="calculator">94 * 3.5</gadget>
<output>329</output>

<result>329</result>