GMAT Quant: Work Rate Typists
Two typists undertake to do a job. The second typist begins working one hour after the first. Three hours after the first typist has begun working, there is still (9/20) of work to be done. When the assignment is completed, it turns out that each typist has done half the work. How many hours would it take each one to do the whole job individually?
A. 12 hours and 8 hours
B. 8 hours and 5.6 hours
C. 10 hours and 8 hours
D. 5 hours and 4 hours
E. 4 hours and 8 hours
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