The big clock at the train station rings 5 times at 5 o'clock, and it takes 8 seconds. How many seconds does it take at 10 o'clock?
火车站的大钟，5点时响5下，需要8秒，那10点时，需要几秒？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">2 * 9</gadget>
<output>18</output>

<result>18</result>