SSC Delhi Police Constable 2025 Mock Test Series (New) Quantitative Aptitude Time and Work Pipe and Cistern
A pipe can fill a tank in 12 hours. Another pipe can empty the filled tank in 28 hours. If both the pipes are opened simultaneously, then the time (in hours) in which the tank will be one-third filled, is:
1
21
2
28
3
14
4
7