It took Liu Ling 30 seconds to go upstairs from the first floor to the third floor. At the same speed, how many seconds does it take to go from the first floor to the fifth floor?
刘玲上楼从一楼到三楼用了30秒，同样的速度，从一楼到五楼需要用多少秒．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>