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 A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both taps are opened simultaneously, then after how much time will the cistern get filled ? A) 4.5 hours B)5 hours C) 6.5 hours D) 7.2 hours (Wipro Question) Asked by Priya kumariCompile Program
 mahi   ans:D 7 years ago
 Tarun Kumar   D 7 years ago
 arunkumar   1/4-1/9=5/36=7.2 7 years ago
 MANOJ   D-7.2 hours.. 7 years ago
 ravi madhukar   d 7.2 7 years ago
 karthickeyan   7.2 hours :-) 7 years ago
 Bipin   Time taken by tap A to fill the cistern=4 hrs Work done by tap A in 1 hour = 1/4th Time taken by tap B to empty the full cistern = 9 hours Work done by tap B in 1 hour = -1/9th Work done by (A + B) in 1 hour=(1/4 - 1/9)=5/36 Therefore, the tank will fill the cistern = 36/5 hours=7.2 hours. 7 years ago
 janardhana   answer is "d". 5 years ago
 shweta kumari   7.2 4 years ago
 d.ayyappa   7.2hr 4 years ago
 Nikhil R. Newhale   1/4-1/9=7.2 4 years ago