3. The diagram shows two rectangles whose corresponding sides are parallel as shown. What is the difference between the lengths of the perimeters of the two rectangles?
A $12 \mathrm{~m}$
B $16 \mathrm{~m}$
C $20 \mathrm{~m}$
D $22 \mathrm{~m}$
E $24 \mathrm{~m}$
3. E The length of the outer rectangle is $(3+4) \mathrm{m}=7 \mathrm{~m}$ longer than the length of the inner rectangle. The height of the outer rectangle is $(2+3) \mathrm{m}=5 \mathrm{~m}$ longer than the height of the inner rectangle. Hence the length of the perimeter of the outer rectangle is $(2 \times 7+2 \times 5) \mathrm{m}=24 \mathrm{~m}$ longer than the length of the perimeter of the inner rectangle.