There is a wall clock, it takes 6 seconds to strike 3 times at 3 o'clock. How many seconds does it take for the wall clock to strike 12 times at 12 o'clock?
有一个挂钟，3时敲3下，要用6秒．这个挂钟12时敲12下，需要用多少秒．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">3 * 11</gadget>
<output>33</output>

<result>33</result>