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

** Option:**

**A.**24 hours

**B.**16 hours

**C.**12 hours

**D.**8 hours

**Answer: A . 24 hours**

** Justification:**

(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