Xiaohong and Xiaoming live in the same building, Xiaohong lives on the 3rd floor, Xiaoming lives on the 6th floor, it takes 12 seconds for Xiaohong to walk home from the first floor, how many seconds does it take for Xiaoming to return home at the same speed.
小红和小明住在同一幢楼，小红住3层，小明住6层，小红从第一层走到家要12秒，小明用同样的速度回到家要多少秒．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

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

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>