8. Given that a truck travels $\frac{b}{6}$ feet in $t$ seconds, and 1 yard equals 3 feet. Then the truck can travel ( ) yards in 3 minutes.
(A) $\frac{b}{1080 t}$
(B) $\frac{30 t}{b}$
(C) $\frac{30 b}{t}$
(D) $\frac{10 t}{b}$
(E) $\frac{10 b}{t}$
8. E.
$$
\frac{\frac{b}{6 t} \times 3 \times 60}{3}=\frac{10 b}{t} .
$$