问题
单项选择题
Working independently, Tina can do a certain job in 12 hours. Working independently, Ann can do the same job in 9 hours. If Tina works independently at the job for 8 hours and then Ann works independently, how many hours will it take Ann to complete the remainder of the job ？（）
A.A
B.B
C.C
D.D
E.E
答案
参考答案：E
解析：
根据题意可知，Tina每小时完成这项工作的[*]，Ann每小时可以完成这项工作的[*]，设Ann还要花x小时来完成这项工作的剩余部分，则有3。