Xiao Zhang X 5y/4 5y/4x
Xiao Li 8x/7 y 7y/8x
The speed ratio of Xiao Li and Xiao Zhang =5y/4x÷7y/8x= 10:7.
It turns out that now
The first x x-5
The second (25-x) 25-x+5-7
x-5=25-x+5-7
x= 14
The first tree is 14 and the second tree is 1 1.