Two people, A and B, are walking toward each other from places A and B which are 5 kilometers apart. A is traveling faster than B, and they meet at a distance of (2/5) kilometers from the midpoint. How many miles did A travel further than B when they met?
甲、乙两人从相距5千米的A、B两地相向而行，甲的速度比乙快，在距中点(2/5)千米处两人相遇．相遇时甲比乙多行多少千米？
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/2) + (2/5)</gadget>
<output>29/10 = around 2.9</output>

<gadget id="calculator">(5/2) - (2/5)</gadget>
<output>21/10 = around 2.1</output>

<gadget id="calculator">(29/10) - (21/10)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>