A man can do a job in 14 days. His father can do the same work in 7 days and his son will take 21 days to complete it. How long will it take to complete the same work, if three of them decide to work together?

A man can do a job in 14 days. His father can do the same work in 7 da

1.	A man can do a job in 14 days. His father can do the same work in 7 days and his son will take 21 days to complete it. How long will it take to complete the same work, if three of them decide to work together?
A.	\(3 \frac{9}{11}\) days
B.	\(3\frac{1}{2}\)days
C.	\(3 \frac{1}{3}\) days
D.	\(3 \frac{7}{11}\)days
Answer» B. \(3\frac{1}{2}\)days

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A man can do a job in 14 days. His father can do the same work in 7 days and his son will take 21 days to complete it. How long will it take to complete the same work, if three of them decide to work together?

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