A walks 80 meters per minute and B walks 60 meters per minute. After two people walk opposite each other on the same ground for 5 minutes, A turns to catch up with B. How many minutes does it take from when A starts chasing B to when A catches up with B?
甲每分钟行80米，乙每分钟行60米．两人同时同地相背行了5分钟后，甲调转方向追赶乙，从甲开始追乙到甲追上乙需用多少分钟？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">140 * (1/4)</gadget>
<output>35</output>

<result>35</result>