Xiaoming and his father go out for a walk at the same time. Xiaoming walks eastward at 60 meters per minute. Dad walks westward at 80 meters per minute. After 5 minutes, his father turns around and chases Xiaoming. How many kilometers did Dad walk when he caught up with Xiao Ming?
小明和爸爸同时出门散步，小明向东走，每分钟行60米，爸爸向西走，每分钟行80米，5分钟后，爸爸掉转方向去追赶小明．爸爸追上小明时一共走了多少千米？
<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>

<gadget id="calculator">35 + 5</gadget>
<output>40</output>

<gadget id="calculator">40 / 1_000</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">80 * (1/25)</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>