railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work Pipe and Cistern
Pipe A and B can fill a tank in 24 hours and 30 hours respectively, however pipe C can empty it in x hours. Pipe A and B are opened for 10 hours and then pipe C is opened. If, tank is emptied in 90 more hours, then find the value of x.
1
15
2
12
3
18
4
20