The distance between A and B is 560 kilometers. Two trains depart from A and B at the same time. A train travels 85 kilometers per hour, and B travels 75 kilometers per hour. How long does it take for the two trains to meet?
甲、乙两城相距560千米，两列火车同时从甲、乙两城相对开出，甲车每小时行85千米，乙车每小时行75千米，两车经过几小时相遇？
<gadget id="calculator">85 + 75</gadget>
<output>160</output>

<gadget id="calculator">560 / 160</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>