Question 46124
30*40+(40+2x)2x+30*2x=1800 or 1200+80x+4x~2+60x=1800 or 4x~2+140x-600 or

x~2+35-150=0 or (x-3.86)(x+38.86)=0 or x=3.86 or x=-38.86 thus the walkway should be about 3.86 feet.