It took 6 seconds for the big clock to strike 4 times at 4 o'clock. Then how many seconds does it take for the big clock to strike 8 times at 8 o'clock?
大钟4时敲4下，用了6秒．那么大钟8时敲8下，要用多少秒．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>