If it takes 30 seconds for a person to go down from the 8th floor to the 2nd floor by taking the elevator, how many seconds will it take to go down from the 8th floor to the 2nd floor?
一个人乘电梯从8楼下到2楼用了30秒，那么乘电梯从8楼下到负2楼要用多少秒．
<gadget id="calculator">8 - 2</gadget>
<output>6</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<result>45</result>