A worker processes 7 parts in 3 hours, how many hours does it take to process one part on average?
某工人3小时加工7个零件，平均加工一个零件要多少小时
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>