• Brainly User
Let the dimensions be l, b, h. We have surface areas of three faces as bh=30, lb=48, hl=40. Multiply these you get (lbh)²=57600. Then volume of cube is going to be lbh=240. Go with option b)
bt the surface area is 2(lb+bh+lh)
That's for the total cuboid, here you just need for one of the two faces. You may verify my answer by reporting it to moderator.