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3 : 2
3x : 2x
keliling = 2(p+l)
60 = 2(3x + 2x)
60 = 2(5x)
60 = 10x
x = 60/10
x = 6
panjang = 3x = (3 x 6) = 18 cm
lebar = 2x = (2 x 6) = 12 cm