Total surface area of a cuboid is given by 2(lb + lh + bh)
where l, b and h represent length, breadth and height of the cuboid repectively.
Since area is equal to 208 cm2.
=> 2(lb + lh + bh) = 208
=> Lb + hL + bh = 104
=> 4L + 6L + 24 = 104
=> 10L = 80
=> L = 8 cm
Hence, length of the cuboid is 8 cm.