Rectangular length =6 decimeters =0.6 meters, width =5 decimeters =0.5 meters, height =6÷4-0.6-0.5=0.4 meters, cuboid surface area = 0.6× 0.5+(0.6× 0.4+0.5× 0.4 )× 2 = 65438.

This problem mainly investigates the surface area formula and volume formula (length× width+length× height× 2+width× height )× 2 volume formula length× width× height (depth) difficulty coefficient:?