JJ181求助

笨蛋加油 · 发表于 2012-3-10 21:15:03

第一百八十一题
A car has traveled d miles in t hours at an average speed of 55 miles/hr. if the car continues to travel at the speed for 2 hours, the total miles it travels would be 40% more than it originally did. how many miles did the car travel in t hours?
（提供者ID：Kayt。狗主算275）
思路：设平均速度为V1=55 已经行驶的时间为T1 应该是已知的（根据狗主答案反推T1=25小时）
列式得 0.4V1*T1=V2*2
V2=0.2V1*T1 =275
怎么还得倒推？那个more than 百分之四十怎么列式？
难道根据已知不能求出T1吗？

treewing929 · 发表于 2012-3-10 22:02:41

d1=55t
d1*(1+40%)=55(t+2)
solve t=5
所以, d2=5*55

JJ181求助

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块