The distance between the two places is 210 kilometers. Two cars, A and B, drive towards each other at the same time. Car A travels 28 kilometers per hour, and car B travels 32 kilometers per hour. How many hours did the two cars meet?
两地间的路程是210千米，甲、乙两辆汽车同时从两地相向开出，甲车每小时行28千米，乙车每小时行32千米．两车几小时相遇？
<gadget id="calculator">28 + 32</gadget>
<output>60</output>

<gadget id="calculator">210 / 60</gadget>
<output>7/2 = around 3.5</output>

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