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 15 hours and 20 hours respectively. A tap can empty the full cistern in 10 hours. All the three taps were open for 4 hours, when it was realized that the emptying tap had been left open then It was then closed. How many hours more would it take for the cistern to be filled?
1
4
2
6
3
8
4
10
5
2