A5. How many posts of length $60 \mathrm{~cm}$ are needed to line a $1.5 \mathrm{~km}$ long street on both sides?
(A) 25
(B) 90
(C) 5000
(D) 250
(E) 2.5
A5. To fence one side, which is $1500 \mathrm{~m}$, with $0.6 \mathrm{~m}$ long fence panels, we need $\frac{1500}{0.6}=\frac{15000}{6}=$ 2500 fence panels, so for both sides we need 5000 fence panels.