Question 698636
width of first rectangle = x
 length of first rectangle = x+6 
width of the second rectangle = x+3
 length of second rectangle = x+4 

2(x+3)+2(x+4)=54
2x+6+2x+8=54
4x=40
x=10





Substituting x: 
width of first rectangle = x = 10 cm
 length of first rectangle = x+6 = 16 cm 
width of the second rectangle = x+3 = 13 cm
 length of second rectangle = x+4 = 14 cm