There is an announcing clock at the railway station, which rings 5 times at 5 o'clock, and the time it takes is 8 seconds. How many seconds does it take to ring 9 times at 9 o'clock?
火车站有个报时钟，5时整敲响5下，所用时间是8秒．9时整敲响9下，所用时间是几秒？
<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>