It takes Xiaoqiang 3 hours to ride a bicycle from A to B. If he walks 2 kilometers first, and his walking speed is 1/3 of his cycling speed, he will arrive 20 minutes later. How many kilometers is the distance between A and B?
小强骑自行车从甲地到乙地需要3小时，如果先步行2千米，步行速度是骑车速度的(1/3)，则晚到20分钟，那么甲，乙两地相距多少千米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">180 / 10</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>