It took Xiao Ming 3 minutes to climb from the first floor to the seventh floor, so calculate how many minutes it will take him to go from the second floor to the fourth floor.
小明从一楼爬到七楼用了3分钟，照这样计算他从二楼到四楼要用多少分钟．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">(1/2) * 2</gadget>
<output>1</output>

<result>1</result>