10/x- 10+6/x- 10+6/x = 1

2. Set the planned date to x days.

2 *( 1/X+ 1/X+3)+X-2/X+3 = 1

3. let the speed of the two be x y.

56/(x+y)= 1.5x/y (the equation based on the time when they met, the right shows the time required for Xiao Ming to walk 1.5 hours, which is the time when they met).

56/(x+y)=8y/3x

The results can be obtained by solving the above two equations.