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Total number of bulbs on AB = 5.
Total number of bulbs on CD = 5.
Total number of bulbs on CB = 18 – 5 (being bulbs on AB) – 5 (being bulbs on CD) + 2 (since the corner bulbs repeat on CB) = 10.
Length of CD = AB = 260cm.
Distance between each bulb = 260 / 4 (being the number of equal distance spaces between 2 bulbs on AB) = 65cm.
Length of platform = distance between each bulb * number of equal distance spaces between 2 bulbs on CB = 65 * 9 = 585cm.