Xiao Ming and Xiao Li went to the vegetable processing factory for an internship. After they worked at the same time for a period of time, Xiao Ming said during the break, "I processed 28 kilograms."

As can be seen from the figure, Xiaoming processes 8kg an hour and Xiaoli processes 40/7kg an hour.

Xiao Ming processed 28 kilograms, so it took Xiao Ming 28/8 hours.

So, Xiaoli processed (40/7) * (28/8) = 20kg.