volume of a cuboid =lenght width and height
let length of a cuboid =5 x cm and width = 3x
cm volume of a cuboid = 1400
cm 3 height = 15 cm
substituting of formula
14000 = 15* 5x* 3x*
14400 = x2
15* 15
WE GET
120 / 15 = X
8 = X
SO LENGTH OF CUBOID = 5 *8 = 40 cm
width of a cuboid = 3*8 = 24 cm
peri meter of cross section =2 (l+w)
2(40 + 24) = 2 (64) = 128 cm
