Question (27/28)
A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled ?(A) 4.5 Hours
(B) 5.6 Hours
(C) 6.4 Hours
(D) 7.2 Hours
Question (28/28)
Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank ?(A) 12 minutes
(B) 15 minutes
(C) 17 minutes
(D) 19 minutes