The clock on the clock face strikes 5 times at 5 o'clock, and it takes 8 seconds. Then it strikes 10 times at 10 o'clock, how many seconds does it take to finish?
钟面上的时钟在5点敲5下，用时8秒，那么10点时敲了10下，几秒钟敲完？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

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

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

<result>18</result>