How many seconds does it take for a clock to strike 3 times at 3 o'clock and 11 times at 11 o'clock?
钟表3时敲3下用6秒，11时敲11下用多少秒．
<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<result>30</result>