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550 - 150 = 400 cm mungkin..
tau dah. maaf
550 = 2 (15.10 + 15.t + 10.t)
550 = 2 (150 + 25t)
550 = 300 + 50t
50t = 550-300
50t = 250
t = 250/50
t = 5 cm