engineering recuitment MAHATRANSCO AE Electrical Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
Two pipes A and B can fill a cistern in 12 minutes and 15 minutes respectively while a third pipe C can empty the full tank in 6 minutes. A and B are kept open for 5 minutes in the beginning and then C is also opened. In what time is the cistern emptied?
1
15 min
2
20 min
3
40 min
4
45 min
5
None of these