It took Xiao Ming 10 seconds to walk from the first floor to the third floor. How many seconds did it take him to walk from the first floor to the fifth floor?
小明从一楼走到三楼用了10秒，照这样他从一楼走到五楼用多少秒．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>