The clock strikes 6 times at 6 o'clock and takes 10 seconds to finish. How many seconds does it take to ring 11 times at 11 o'clock?
时钟6时敲响6下，需10秒敲完．11时敲响11下，需要多少秒．
<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>