It took Ding Ding 12 seconds to climb the stairs from the first floor to the third floor. At this speed, how many seconds does it take to climb from the first floor to the eighth floor?
丁丁爬楼梯，从第一层楼爬到第三层楼用了12秒，照这个速度，从第一层楼爬到第八层楼需要多少秒？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<result>42</result>