The school's wall clock rings once every hour, and it rings a few times at what time. Now the bell rings five times, and it will finish ringing in 4 seconds. When the bell rings ten times, how many seconds will it take to finish ringing?
学校的挂钟，每小时响一次，几点就响几下．现在钟响五下，4秒钟就响完，当钟响十下时，需要多少秒钟响完．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 / 4</gadget>
<output>1</output>

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

<gadget id="calculator">1 * 9</gadget>
<output>9</output>

<result>9</result>