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2x + 2y = 480
5x = 3y
x + y = 240
5x - 3y = 0
x = 240 - y
5 * (240 - y) - 3y = 0
1200 = 3y + 5y
8y = 1200
y = 1200/8
y = 150m
x = 240 - 150
x = 90m