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 16 hours and pipe B can fill it in 18 hours. Both the pipes are opened and after four hours, pipe A is closed. How much time will B take to fill the remaining part of the tank?
1
10 hours
2
10.5 hours
3
9 hours
4
9.5 hours