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120x2 = (3x+5x) x t
240 / 10 = 8x
24/8 = x
3 = x
3x = 9 cm
5x = 15 cm
luas= (x+y) t/2
120= (3/5 y+y) 10/2
24=8/5 y
y=15 cm
x= 3/5. 15=9 cm