题目内容双击单词支持查询和收藏哦~
收藏
纠错
If it takes Daniel 9 hours to clean an office building and it takes Mark 6 hours, how long would it take the two of them, working together, to clean the building?
-
A.3 hours
-
B.3 hours 36 minutes
-
C.4 hours 45 minutes
-
D.6 hours
-
E.7 hours 30 minutes
B显示答案