SOLUTION: A can finish a job in 12 hours. B can finish that same job in 16 hours. If A works on a job for 9 hours, how long will it take B to finish it?

SOLUTION: A can finish a job in 12 hours. B can finish that same job in 16 hours. If A works on a job for 9 hours, how long will it take B to finish it?

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Question 865192: A can finish a job in 12 hours. B can finish that same job in 16 hours. If A works on a job for 9 hours, how long will it take B to finish it?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1/12+1/16=1/x
9/12+b/16=1
b/16=1/4
b/16=4/16
b=4

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