It takes 30 seconds for Xiao Ming to climb from the first floor to the third floor. At this speed, how many seconds will it take to climb from the first floor to the sixth floor?
小明从一层楼爬到三层楼用30秒，照这样的速度，从一层楼爬到六层楼，要用多少秒．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

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

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<result>75</result>