Question 549906
Naomi Ericson and Ricky Mendoza work for a computer software company. Together they can write a particular computer program in 17 hours. Naomi can write the program by herself in 13.04 hours. How long will it take Ricky to write the program alone? 
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Comment:
If Naomi can do it in 13.04 hours alone why do they require 
15 hrs to do it when they both work at it?
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Cheers,
Stan H.