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A and B do a job together in two hours.Working alone A does the job in 5 hours.How long will it take B to do the job alone?

 Jan 6, 2020
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Person A does 1/5 of the job in an hour.

Person B does 1/x of the job in an hour.

A and B do 1/5+1/x of the job in an hour.

1/5+1/x = 1/2.

\(\frac{1}{5}+\frac{1}{x}=\frac{1}{2}\)

\(x=\frac{10}{3}\) hours.

 

You are very welcome!

:P

 Jan 6, 2020

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