A rectangular block is such that the sides of its base are of length x cm and 3x cm. The

sum of the lengths of all its edges is 20 cm.

a) Show that the volume, V cm^3, is given by V = 15x^2 − 12x^3.

I get that V = L*W*H

However, I cannot visualise this "rectangular block". Can someone show me what this block looks like?