Two trains leave opposite to each other from AB respectively. The slow train travels 55 kilometers per hour, and the express train travels 65 kilometers per hour. The two trains travel at the same time for 1 hour, which is exactly (3/5) of the full length. What percentage of the total length did the slow train travel at this time?
两列火车分别从AB两地相对开出，慢车每小时行55千米，快车每小时行65千米，两车同时行了1小时，刚好行了全长的(3/5)．这时慢车行了全长的百分之几？
<gadget id="calculator">55 + 65</gadget>
<output>120</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/5)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">120 * (5/3)</gadget>
<output>200</output>

<gadget id="calculator">55 / 200</gadget>
<output>11/40 = around 0.275</output>

<result>11/40 = around 0.275</result>