railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
A tap fills a tank in 27 hours and another tap empties it in 36 hours. If both taps are operated together simultaneously, how long (in hours) would it take to fill the four-ninth part of the tank?
1
72
2
96
3
100
4
48