冲刺宝典

SAT数学

频道点击进入频道

SAT数学Problem Solving练习题（39）

互联网2017-07-27 13:56:12

3344

问题相似？试试立即获取解答吧~

摘要：下面是小站SAT频道为大家整理了SAT数学Problem Solving练习题(39)，供考生们参考，以下是详细内容。

以下是小站SAT频道为大家整理了SAT数学Problem Solving练习题(39)，供考生们参考，以下是详细内容。

Question 39: A vehicle runs from town A to town B at a speed of 20 miles/hour while another vehicle runs from town B to town A at a speed of 60 miles/hour. Both vehicles start their trips at the same time and the distance between towns is 100 miles. How long does it take from the time they start running to the moment they are at the same point on the road?

(a) 1 hour

(b) 1 hour and 15 minutes

(c) 1 hour and 30 minutes

(d) 1 hour and 45 minutes

(e) 2 hours and 15 minutes

100 miles = d1 + d2 This is equation #1.

It take the same time for the 2 cars to meet: t = d1/(20 miles/hour) = d2/(60miles/hour). This is equation #2.

We solve the system of 2 equations to find d1 and d2.

From equation #2, 3·d1 = d2.

Then 100 miles = d1 + d2 = 4·d1, so d1 = 25 miles and d2 = 75 miles.

The answer is t = d1/20miles/hour = 25/20 = 5/4 = 1 hour and 15 minutes.

下载小站SAT APP，刷SAT真题

看完仍有疑问？想要更详细解答？

相关推荐

版权申明 | 意见反馈 | 联系我们 | 关于我们
© 2011-2024 ZHAN.com All Rights Reserved.
沪ICP备13042692号-23

沪公网安备 31010602002658号
增值电信业务经营许可证：沪B2-20180682

定制专属课程规划

获取验证码 60s后重发

开始定制

你可以享受

领取成功

添加助教，定制你的专属课程规划

每日提分任务

专业提分资料

全程督学答疑