b) length = 60 mm, breadth = 40 mm, height = 55 m
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Step-by-step explanation:
Surface Area of Cuboid = 2 ( lb + bh + hl)
= 2 (60 × 40 + 40 × 55 + 55 × 60)
= 2 (7900) mm
= 15,800 mm
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