GRE考试

试题来源：2012年新GRE数学考试模拟练习题（2）
【分析解答题】If Bob can do a job in 20 days and Jane can do the job in 30 days, they work together to do this job and in this period, Bob stop work for 2.5 days and Jane stop work for x days, and the job be finished for 14 days, what is x?
(A) 1.6
(B) 3.2
(C) 1.5
(D) 1.25
(E) 1.15

网考网解析：
解：1/20(14-2.5)+1/30(14-x)=1，得出x=1.25 查看试题解析出处>>