Zhang Shuo and Li Hua hosted the class's 12th blackboard newspaper, which could be completed within 8 hours of cooperation. After Zhang Shuo worked for 2 hours, Li Hua continued to work for 1 hour. At this time, he completed (1/4) of the blackboard report. How many hours would it take for Zhang Shuo to run this blackboard newspaper by himself?
张硕和李华主办班级第12期板报，两人合作8小时可以完成．张硕做了2小时后李华接着做了1小时，这时共完成了黑板报的(1/4)．如果张硕一个人办这期黑板报，需要多少个小时？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 1</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) - (1/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / (1/8) / 1</gadget>
<output>8</output>

<result>8</result>