2015 AMC 8 第 3 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
3.
杰克和吉尔要去离家一英里的游泳池游泳。他们同时离家。吉尔以每小时 英里的恒定速度骑自行车去游泳池。杰克以每小时 英里的恒定速度步行去游泳池。吉尔比杰克早到多少分钟？
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 a constant speed of miles per hour. Jack walks to the pool at a constant speed of miles per hour. How many minutes before Jack does Jill arrive?
答案：D
小提示：
求每个人走完一英里分别需要多少分钟
Find how many minutes each person takes to travel one mile.
大提示：
用杰克的时间减去吉尔的时间
Subtract Jill’s travel time from Jack’s travel time.
视频讲解：
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文字解答：
杰克走 英里需要 分钟，所以他到游泳池需要 分钟。
吉尔骑行 英里需要 分钟，所以她到游泳池需要 分钟。
两人的时间差为 分钟。
所以正确答案是 D。
Jack travels at a rate of miles per minutes. Therefore, it takes him minutes to get to the pool.
Jill travels at a rate of miles per minutes. Therefore it takes her minutes to get to the pool.
Therefore, the difference in their times is minutes.
Thus, the correct answer is D .
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