X can do a piece of work in 8hours. Y and Z together can do it in 6 hours, while X and Z together can do it in 4 hours. How long will Y alone take to do it?	Choose the correct choice from the following answers
A) 24 HOURS	B) 20 HOURS	C) 34 HOURS	D) 12 HOURS	E) 10 HOURS
X's 1 hour work= 1/8   (Y+Z)'s 1 hour work= 1/6   (X+Z)'s 1 hour work= 1/4   (X+Y+Z)'s 1 hour work= (1/8+1/6)=7/24   Y's 1hour's work= (7/24-1/4)= 1/24   Y alone will take 24 hours to do the work.   correct option is 24 HOURS
<result>A</result>
X can do a piece of work in 8hours. Y and Z together can do it in 6 hours, while X and Z together can do it in 4 hours. How long will Y alone take to do it?