It takes Fangfang 40 seconds to go from the 1st floor to the 5th floor, how many seconds does it take her to go from the 2nd floor to the 7th floor.
芳芳从1楼到5楼要用40秒，这样计算她从2楼到7楼要用多少秒．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<result>50</result>