To process a batch of parts, if 30 people work 8 hours a day, then the processing can be completed in 15 days. After 8 days of processing, the remaining tasks must be completed within 5 days. How many hours should you work each day? (Each person has the same amount of work per day)
加工一批零件，如果用30人每天工作8小时，那么加工15天可以完成．加工了8天后，余下的任务要在5天内完成，每天应工作几小时？(每人每天的工作量相同)
<gadget id="calculator">30 * 8 * 15</gadget>
<output>3_600</output>

<gadget id="calculator">30 * 8 * 8</gadget>
<output>1_920</output>

<gadget id="calculator">3_600 - 1_920</gadget>
<output>1_680</output>

<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">1_680 / 150</gadget>
<output>56/5 = around 11.2</output>

<result>56/5 = around 11.2</result>