选择题
2015 AMC 8 Problem 17: Rush Hour Drive
Jeremy's father drives him to school in rush hour traffic in 20 minutes. One day there is no traffic, so his father can drive him 18 miles per hour faster and gets him to school in 12 minutes. How far in miles is it to school?
2015 AMC 8 第 17 题：高峰时段驾驶
杰里米的父亲在高峰时段开车 20 分钟内送他去学校。有一天，没有交通堵塞，所以他的父亲可以以每小时 18 英里的速度开他，并在 12 分钟内送他到学校。到学校有多远（英里）
A.
4
B.
6
C.
8
D.
9
E.
12