The Hangzhou-Ningbo railway is 168 kilometers long, and two trains, A and B, run towards each other from the two cities at the same time. Car A travels 68 kilometers per hour, and car B travels 72 kilometers per hour. How long will they meet each other?
杭州至宁波铁路长168千米，甲乙两列火车分别从两城同时相向而行．甲车每小时行68千米，乙车每小时行72千米，几小时相遇？
<gadget id="calculator">68 + 72</gadget>
<output>140</output>

<gadget id="calculator">168 / 140</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>