6× 2 (1-1114) = 56 (cm).

56×1114 = 44 (cm)

44+56= 100 (cm)

The second method:

Use their equal time to set the equation. Distance/speed = time.

Solution: Let the total length of the rectangle be x cm, the speed of the cat be y, and the speed of the mouse be1114y.

(x÷2-6)÷ 1 1/ 14y =(x÷2+6)÷y

As can be seen from the formula, y on the left and right sides can be removed at this time, so the formula becomes

(x÷2-6)÷ 1 1/ 14 =(x÷2+6)

x= 100