tlg di jawab dikumpulkan bsok please

K = 40 m
p : l = 5 : 3
L = 3/5 p
k = 2 (p + l)
40 = 2 (p + l)
20 = p + l
20 = p + 3/5 p
20 = 8/5 p
100 = 8p
p=12,5 m
L = 3/5 p
L=3/5 × 12,5
L = 7,5 m