The students in the fifth grade went to visit the Huang Jiguang Memorial Hall, and they spent 3 hours together. The time spent on the road accounted for (1/5), the rest time accounted for (1/6), and the rest was the time for sightseeing. How much time was spent for sightseeing? How much?
五年级的同学去参观黄继光纪念馆，共用去3小时，其中路上用去的时间占(1/5)，休息的时间占(1/6)，剩下的是游览时间，游览的时间占几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) + (1/6)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">1 - (11/30)</gadget>
<output>19/30 = around 0.633333</output>

<result>19/30 = around 0.633333</result>