insurence exam LIC HFL Junior Assistant Mock Tests 2024 Quantitative Aptitude Time and Work Pipe and Cistern
Two pipes P and Q can fill the cistern in 90 minutes and 120 minutes respectively. Initially both pipes are opened. The cistern will be half-filled in just 30 minutes, if Q is switched off after:
1
22.5 min
2
20 min
3
45 min
4
40 min
5
None