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2014-11-02T22:42:25+02:00
P = 320 cm
2(L + l ) = 320cm
L + l = 320 / 2 = 160 cm
L = 3l
3l + l = 160 
4l = 160
l = 160 / 4 = 40 cm
L = 3l = 3 * 40 = 120 cm

PROBA:
P = 2(L + l ) = 2(120 + 40) = 2 * 160 = 320 cm