engineering recuitment HPCL Engineer Mock Test 2024 Quantitative Aptitude Time and Work Pipe and Cistern
Pipes A and B can empty a full tank in 36 and 45 minutes, respectively, whereas pipe C alone can fill the tank in 15 minutes. B and C are opened together for 15 minutes, and then both are turned off and A is opened. Pipe A will empty the tank in (in minutes):
1
30
2
18
3
20
4
24