Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
If A fills a tank in 30 min and B empties it in 60 minutes, how long will it take to fill the tank if both A and B are operated together?
1
15 min
2
55 min
3
83 min
4
60 min
5
None of the above