The big clock on the square strikes 5 times at 5 o'clock and finishes in 8 seconds. 12 rings at 12 o'clock, how long does it take to finish knocking?
广场上的大钟5时敲5下，8秒钟敲完．12时敲响12下，敲完需要多少时间．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

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

<gadget id="calculator">2 * 11</gadget>
<output>22</output>

<result>22</result>