The lid of a rectangular box of sides 40 cm by 10 cm is sealed all round with tape. What is the length of the tape required?

It is given in the question that,

Length of the rectangular box = 40 cm

Breadth of the rectangular box = 10 cm

Therefore,

Length of tape required = Perimeter of rectangular box

= 2 (l + b)

= 2 (40 + 10)

= 100 cm