X and Y together complete a work in 8 hours. If X alone can complete it in 12 hours than Y alone can

A. 24 hours

B. 16 hours

C. 12 hours

D. 8 hours

E. None of the above

Answer: A. 24 hours

(X + Y)'s I hr's work = 1/8
X's 1 hr's work = 1/12
So, Y's 1 hr's work
= 1/8 = 1/12
= (3 - 2)/24 = 1/24

Posted in: Time & Work - Aptitude - Mathematics