state gov Kerala PSC Degree (Common Preliminary Examination) Mock Test Series 2025 Quantitative Aptitude Time and Work Pipe and Cistern
A tap can empty a tank in 30 minutes. A second tap can empty it in 45 minutes .If both the taps operate simultaneously, how much time is needed to empty the tank?
1
30 min
2
18 min
3
14 min
4
15 min