Xiaojun rode his bike from Huaxi Middle School to Xinhua Bookstore in Jiefangbei. He started from Huaxi Middle School by bicycle and completed half of the distance in 30 minutes. At this time, he speeded up and traveled 50 meters more per minute than before. After another 20 minutes of riding, he knew from the mileage sign on the roadside that he had to ride another 2 kilometers to arrive at Jiefangbei Xinhua Bookstore, asking for the total distance between Huaxi Middle School and Jiefangbei Xinhua Bookstore.
小军从花溪中学骑车去解放碑新华书店．他从花溪中学骑车出发，用30分钟时间行完了一半路程，这时，他加快了速度，每分钟比原来多行50米．又骑了20分钟后，他从路旁的里程标志牌上知道，必须再骑2千米才能赶到解放碑新华书店，求花溪中学到解放碑新华书店之间的总路程．
<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 + 2_000</gadget>
<output>3_000</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<gadget id="calculator">3_000 / 10</gadget>
<output>300</output>

<gadget id="calculator">2 / 1_000</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">30 * 300 * (1/500)</gadget>
<output>18</output>

<result>18</result>