Xiao Zhou drove to a certain conference center. 20 minutes after departure, due to traffic jam, he was delayed for 20 minutes. In order to arrive at the conference center on time, Xiao Zhou increased his speed by 25% and finally arrived on time. How many minutes did it take Xiao Zhou to arrive at the conference center from departure?
小周开车前往某会议中心，出发20分钟后，因为交通堵塞，中途延误了20分钟，为了按时到达会议中心，小周将车速提高了25%，最后按时到达．小周从出发到达会议中心共用了多少分钟？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / (5/4)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / (4/5)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(5/4) * 20</gadget>
<output>25</output>

<gadget id="calculator">(5/4) - 1</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">25 / (1/4)</gadget>
<output>100</output>

<gadget id="calculator">100 + 20</gadget>
<output>120</output>

<result>120</result>