The students in class 5 and 1 went on an autumn outing and spent 6 hours in total. The time spent on the road accounted for (1/5) of the total time, and the time for lunch accounted for (1/4) of the total time. The rest was for sightseeing. What percentage of time?
五1班学生去秋游，共用去6小时，其中路上用去的时间占总时间的(1/5)，吃午饭的时间占总时间的(1/4)，剩下的是游览时间，游览时间占几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>