If it takes 3 minutes to walk from the first floor to the third floor, how many minutes will it take to walk from the first floor to the fifth floor?
从一楼走到三楼需要3分钟，那么从一楼走到五楼需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

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

<gadget id="calculator">(3/2) * 4</gadget>
<output>6</output>

<result>6</result>