PLEASE HELP ASAPa rectangular garden has length three times as great as its width a second rectangular garden has the same width as the first garden and length that is 3 meters greater than the length of the first garden the second garden has area of 90 square meters what is the width of the two gardens?

Let,
L1,B1 be the length & width of first garden
L2,B2 be the length & width of second garden
Given ,
L1 = 3 (B1) 
B1 = B2
L2 = L1+3 &
L2* B2 = 90
So,(L1+3)*B1 = 90
(3(B1)+3)*B1= 90
By solving,
B1= 5
So, B1=B2=5
L1= 3*5 = 15
L2= 3+15 =18