It takes 3 minutes for Xiaohua to go up from the first floor to the third floor, how many minutes will it take to go up to the seventh floor at the same speed.
小华从一楼上到3楼用3分钟，同样的速度上到7楼要多少分钟．
<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">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">(3/2) * 6</gadget>
<output>9</output>

<result>9</result>