Xiaohua takes 2 minutes to go from the 1st floor to the 5th floor, how many floors can she go from the 1st floor to the 5th floor in 4 minutes at the same speed.
小华从1楼上到5楼用2分钟，她用同样的速度4分钟能从1楼上到多少楼．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / (1/2)</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>