选择题
2015 AMC 8 Problem 3: Race to the Pool
Jack and Jill are going swimming at a pool that is one mile from their house. They leave home simultaneously. Jill rides her bicycle to the pool at 10 miles per hour. Jack walks to the pool at 4 miles per hour. How many minutes before Jack does Jill arrive?
2015年AMC 8 第3题 ：游泳池竞赛
杰克和吉尔将在距离他们家一英里的游泳池里游泳。他们同时离家出走。Jill以每小时10英里的速度骑自行车去游泳池。Jack以每小时4英里的速度步行到泳池。Jill在Jack到达前几分钟到达？
A.
5
B.
6
C.
8
D.
9
E.
10