It took Xiaohua 55 seconds to run 300 meters, and Xiaojun took 1 minute and 15 seconds. Who ran faster? How many seconds faster?
小华跑300米用了55秒，小军用了1分15秒，谁跑得快？快了多少秒？
<gadget id="calculator">75 - 55</gadget>
<output>20</output>

<result>20</result>