In a 100-meter race, Xiaogang ran for 17.8 seconds, and Xiaoqiang ran for 19.5 seconds. Who ran faster and how many seconds faster?
一次百米赛跑中，小刚跑了17.8秒，小强跑了19.5秒，谁跑的快，快多少秒？
<gadget id="calculator">19.5 - 17.8</gadget>
<output>1.7</output>

<result>1.7</result>