SOLUTION: Ricky can install a basic security system in 4 hours. If it takes Ricky and Mark 2 hours working together to install this system, how long does it take Mark working alone?

Question 112922: Ricky can install a basic security system in 4 hours. If it takes Ricky and Mark 2 hours working together to install this system, how long does it take Mark working alone?
Answer by awang1996(50) (Show Source): You can put this solution on YOUR website!
Ricky can install a basic security system in 4 hours. If it takes Ricky and Mark 2 hours working together to install this system, how long does it take Mark working alone?

It would take Mark 4 hours by himself.
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