When Xiaoming's clock is telling the time, it strikes every 5 seconds, how many times every hour, and how many seconds it takes for the clock to tell the time at nine o'clock.
小明家的时钟在报时的时候，每隔5秒敲一下，几小时敲几下，九点钟的时候，时钟报时一共用了多少秒．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>