Li Jin and Song Zhuo walked in the opposite direction of the escalator. Within 20 seconds, Song Zhuo walked up 27 steps, and Li Jin walked up to 24 steps. At this speed, Song Zhuo reached the other end in 2 minutes, and Li Jin reached the other end in 3 minutes. How many steps are there in the escalator?
李金和宋卓逆着自动扶梯的方向行走，20秒内宋卓走了27级，李金走了24级，照此速度，宋卓2分钟到达另一端，李金3分钟到达另一端，则该自动扶梯共有多少级？
<gadget id="calculator">120 / 20</gadget>
<output>6</output>

<gadget id="calculator">6 * 27</gadget>
<output>162</output>

<gadget id="calculator">180 / 20</gadget>
<output>9</output>

<gadget id="calculator">9 * 24</gadget>
<output>216</output>

<gadget id="calculator">216 - 162</gadget>
<output>54</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">54 / 1</gadget>
<output>54</output>

<gadget id="calculator">54 * 2</gadget>
<output>108</output>

<gadget id="calculator">162 - 108</gadget>
<output>54</output>

<result>54</result>