Two cubes each of edge 5 cm are joined end to end. Find the surface area of the resulting cuboid.

Given: Edge of the cube = 5 cm

After joining two cubes,

Total length, $l=5+5=10 cm$

Breadth, $b=5 cm$ and Height, $h=5 cm$

Surface Area of Cuboid $=2(lb+bh+hl)$

 $=2(10\times 5+5\times 5+5\times 10)$

$=2(50+25+50)$

$=250 c{m}^2$

Therefore, the surface area of the resulting cuboid is $250 c{m}^2$.