engineering recuitment Punjab SSSB Jr Draftsman Civil Mock Test 2021 Quantitative Aptitude Time and Work Work Efficiency
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?
1
\(3\dfrac{9}{11}\space days\)
2
\(3\dfrac{7}{11}\space days\)
3
\(3\dfrac{1}{2}\space days\)
4
\(3\dfrac{1}{3}\space days\)