Answer:
60 miles
Step-by-step explanation:
If 0.5 inches = 20 miles, then 1.5 inches = 0.5 inches x 3 = 20 miles x 3 = 60 miles.
(x, y, z) = (-1, -4, -5)
(x, y, z) = (Dx, Dy, Dz)/D = (-6, -24, -30)/6