Master Wang needs to pack a batch of goods. The original plan is to pack 30 pieces per hour, which can be completed in 6 hours. The actual packing is 20% more than the original plan per hour. How many hours earlier than the original plan?
王师傅需对一批货物进行打包，原计划每小时打包30件，6小时可以完成，实际每小时比原计划多打包20%，实际打包这批货物比原计划提前几小时？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">30 * (6/5)</gadget>
<output>36</output>

<gadget id="calculator">6 / 36</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">30 * (1/6)</gadget>
<output>5</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<result>1</result>