Civil Services UPSC EPFO (EO/AO) Mock Test 2023 Quantitative Aptitude Time and Work Pipe and Cistern
Two pipes, A and B can fill a tank in 16 and 20 hours respectively. If both are opened together and at the end of 4 hours pipe A is closed, How long will the pipe B take to fill the remaining part of the tank?
1
11 hours
2
13 hours
3
16 hours
4
9 hours