A cistern is two-third full of water. Pipe A can fill the remaining part in 12 minutes and pipe B in 8 minutes. Once the cistern is emptied, how much time will they take to fill it together completely?  Answers:	A) 12 minutes	B) 12.5 min	C) 14.4 min	D) 10.2 min	E) 14.66 min
As pipe A takes 12min. to fill remaining one-third it takes 36min. to fill completely. similarly pipe B takes 24min. to fill completely   so, total time taken by both together is reciprocal of:   (1/36)+(1/24)=5/72   ans:14.4 min.   ANSWER:14.4 min
<result>C</result>
A cistern is two-third full of water. Pipe A can fill the remaining part in 12 minutes and pipe B in 8 minutes. Once the cistern is emptied, how much time will they take to fill it together completely?