Selection of athletes: In the 100-meter running selection competition, Xiao Ming took 17.15 seconds, and Xiao Ming and Xiao Hua shared 32.4 seconds. How many seconds did Xiao Ming take longer than Xiao Hua?
选拔运动员：百米跑步选拔赛中，小明用17.15秒，小明和小华一共用了32.4秒．小明比小华多用几秒钟？
<gadget id="calculator">32.4 - 17.15</gadget>
<output>15.25</output>

<gadget id="calculator">17.15 - 15.25</gadget>
<output>1.9</output>

<result>1.9</result>