A rectangular runway is 20 meters wide and 100 meters long. Two people, A and B, are running on the runway. If they start at the same time with their backs facing each other, they meet after 48 seconds. Finally, A catches up with B, and now they are at the same place, B first starts 20 seconds later, A catches up again, after a few seconds, A catches up with B?
一个长方形的跑道，宽20米，长100米，甲乙两人在跑道上跑步，若两人同时同地背向出发，经48秒后相遇，若两人同时同地同向出发，经过5分钟后，甲追上乙，现在两人在同一地点，乙先出发20秒后，甲再追赶，经过几秒钟后，甲追上乙？
<gadget id="calculator">100 + 20</gadget>
<output>120</output>

<gadget id="calculator">2 / 48</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">120 * (1/24) * 60</gadget>
<output>300</output>

<gadget id="calculator">2 / 300</gadget>
<output>1/150 = around 0.006667</output>

<gadget id="calculator">120 * (1/150)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2.1 / (4/5)</gadget>
<output>2.625</output>

<gadget id="calculator">20 * 2.625</gadget>
<output>52.5</output>

<result>52.5</result>