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GMAT - Problem Solving - Geometry

The figure shown above represents a modern painting that consists of four differently colored rectangles, each of which has length l and width w.

The figure shown above represents a modern painting that consists of four differently colored rectangles, each of which has length l and width w. If the area of the painting is 4,800 square inches, what is the width, in inches, of each of the four rectangles? 
A. 15 
B. 20 
C. 25 
D. 30 
E. 40

from the figure

length of one single rectangle = 3w

width of the complete painting = w + 3w = 4w

area of the painting = l*total width = 3w*4w = 12w2

4800 = 12w2

w2 = 400

w = 20 inches

B is correct