state gov WBPSC Miscellaneous Services Mock Test 2023 Quantitative Aptitude Time and Work Pipe and Cistern
Tap A fills a tank in 12 hours, while Tap B empties the same tank in 20 hours. If both the taps are open together, the tank will fill in:
1
36 hours 24 min
2
24 hours 45 min
3
20 hours
4
30 hours