SOLUTION: If Mark can do chores in ¾ of an hour, and if Bren and Mark together can do them in ½ of an hour, how long will it take them to Bren to finish the work?
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Question 1165825: If Mark can do chores in ¾ of an hour, and if Bren and Mark together can do them in ½ of an hour, how long will it take them to Bren to finish the work? Answer by ikleyn(52787) (Show Source):
The combined rate of work of Bren and Mark is = 2 jobs per hour.
The individual rate of work by Mark is = jobs per hour.
Hence, the individual rate of work by Bren is the difference 2 - = of the job per hour.
It means that Bren can complete the job in hours = 1 hours = 1 hour and 30 minutes, working alone. ANSWER
