Question

X and Y and Z can independently complete a piece of work in 6 hours, 4 hours and 12 hours
respectively. If they work together, how much time will they take to complete that piece of
work?
(A)3 hours
(B) 5 hours
(C)6 hours
D)2 hours​

Answer 1

Answer:

Option B : 5 hours

Step-by-step explanation:

the eitire work will get done in 5 hours like 1/6+1/4+1/6+1/4+1/6 = 3/6+2/4 = 1/2+1/2 = 1. Thus in 1 + 1 + 1 + 1 + 1 = 5 hours, the entire work will be done.