Fri 17 Apr, 2009 11:32 pm - i am talking about math .gosh someone asked me are they union so i asked what kind of union meaning is he talking about. (view)
Fri 17 Apr, 2009 11:19 pm - Hyunjoo can finish a job in 3 hours.Minkyung can complete the same job in 2 hours. If both of them work together on the same job, How long does it take them to complete the job? (view)
