The school held a 100-meter running competition. Xiao Ming took 19 seconds. Xiao Qiang was 2 seconds faster than Xiao Ming. How many seconds did Xiao Qiang take?
学校举行100米跑步比赛，小明用了19秒，小强比小明快2秒，小强用了多少秒？
<gadget id="calculator">19 - 2</gadget>
<output>17</output>

<result>17</result>