Xiao Wang takes 1 hour longer to make 1600 parts than Xiao Li does to make 1200 parts. The ratio of work efficiency between Xiao Wang and Xiao Li is 5:4. How many parts does Xiao Li make per hour? (Solve with ratio)
小王做1600个零件比小李做1200零件多用1小时，小王与小李工作效率的比是5：4，小李每小时做零件多少个？(用比例解)
<gadget id="calculator">1_200 / 15</gadget>
<output>80</output>

<result>80</result>