It takes 5 seconds for a clock to strike 6 times, how many seconds does it take to strike 12 times?
一个钟敲6下用5秒，敲12下用多少秒．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 / 5</gadget>
<output>1</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">1 * 11</gadget>
<output>11</output>

<result>11</result>