To repair a canal, it was originally planned that 8 people would work 7.5 hours a day, and the task could be completed in 6 days; due to the urgent need for irrigation, 2 people were added, and it took 4 days to complete. How many hours do you work every day.
修整一条水渠，原计划由8人修，每天工作7.5小时，6天可以完成任务；由于急需要灌水，增加了2人，需要4天完成．每天要工作多少小时．
<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">6 / 10 / 4</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">7.5 * 8 * (3/20)</gadget>
<output>9</output>

<result>9</result>