Xiaolan and Xiaoqiang ran a running competition. Xiaolan took 20 seconds to run 100 meters, and Xiaoqiang took 17 seconds to run 100 meters. Which of them ran faster? How many seconds?
小兰和小强跑步比赛，小兰跑100米用了20秒，小强跑100米用了17秒，他俩谁跑得快？快几秒？
<gadget id="calculator">20 - 17</gadget>
<output>3</output>

<result>3</result>