Home » Aptitude » Time and Work

A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?

Correct Answer: 12 hours

Explanation:


A's 1 hour's work = 1 ;
4



(B + C)'s 1 hour's work = 1 ;
3



(A + C)'s 1 hour's work = 1 .
2



(A + B + C)'s 1 hour's work = 1 + 1 = 7 .
4 3 12



B's 1 hour's work = 7 - 1 = 1 .
12 2 12


∴ B alone will take 12 hours to do the work.


← Previous Question Next Question→

More Questions from Time and Work

Discussion & Comments

No comments yet. Be the first to comment!
Join Discussion