It takes 18 seconds to climb from the first floor to the third floor. With the same speed, how many seconds does it take to climb from the first floor to the sixth floor?
从一楼爬到三楼要用18秒，用同样的速度，从一楼爬到六楼需要多少秒？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

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

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>