railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work Pipe and Cistern
Pipes A, B and C can fill a tank in 10, 15 and 18 hours, respectively. A and C are opened for 5 hours, then only pipe A is closed and B is opened at the same time (with C). The total time taken to fill the tank completely is:
1
3\(\frac{2}{3}\) hours
2
6\(\frac{9}{11}\) hours
3
5\(\frac{8}{11}\) hours
4
2\(\frac{1}{3}\) hours