Same direction: 2J-2L = 400 ... (Xiaojie ran one lap more than Xiaoli)
Reverse:10/11(j+l) = 400 ...
The solutions are J=320, L= 120 or L=320 and J= 120.
(The answer has a word limit. . . )
Behavioral psychology is the first force in psychology, which has brought substantial influence on the scientific status, research objects, research methods and prac