Two people, A and B, walk towards each other from two places at the same time, and meet at a distance of 40 meters from the midpoint. It is known that A has traveled the entire distance (11/20), and how many kilometers A has traveled when they met.
甲乙两人同时从两地相向而行，在距离中点40米处相遇，已知甲行了全程的(11/20)，相遇时甲行了多少千米．
<gadget id="calculator">11 / 20</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(11/20) - (9/20)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 / (1/10)</gadget>
<output>20</output>

<gadget id="calculator">40 * 20 * (11/20)</gadget>
<output>440</output>

<result>440</result>