If the clock strikes 5 times at 5 o'clock, it will take 8 seconds to complete the strike, and if it strikes 9 times at 9 o'clock, how many seconds will it take to complete the strike?
时钟5点钟敲5下，8秒钟敲完，9点钟敲9下，多少秒钟敲完？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">2 * 8</gadget>
<output>16</output>

<result>16</result>