3. Randy drove on a trip, knowing that the first $\frac{1}{3}$ of the journey was on a gravel road, the next 20 miles were on a sidewalk, and finally, the remaining $\frac{1}{5}$ of the journey was on a dirt road. Then Randy's total distance traveled on this trip was ( ) miles.
(A) 30
(B) $\frac{400}{11}$
(C) $\frac{75}{2}$
(D) 40
(E) $\frac{300}{7}$
3. E.
$$
20 \div\left(1-\frac{1}{3}-\frac{1}{5}\right)=\frac{300}{7}
$$