It takes Xiao Ming 30 seconds to go from the ground to the second floor. At this speed, how many seconds will it take to go from the ground to the fifth floor?
小明从地面到2楼用时30秒，以此速度，从地面到5楼要多少秒．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">30 / 1</gadget>
<output>30</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<result>120</result>