railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work Pipe and Cistern
Pipe A can fill a tank in 5 hours and pipe Q can empty a tank in 12 hours. If both the pipes are opened. How much time it will take to fill the tank?
1
\(8{4\over 7}\) hours
2
\(3 {1\over 7} \) hours
3
\(7 {1\over 7} \) hours
4
\(4{1\over 7} \) hours