state gov Bihar Police Constable (सिपाही) Mock Test Series 2025 Quantitative Aptitude Time and Work Pipe and Cistern
Three pipes A, B, and C can fill a tank in 20, 15, and 30 hrs respectively. If all the pipes are open at the same time, then what is the time taken to fill the tank?
1
6.67 hrs
2
15 hrs
3
10 hrs
4
5 hrs