police West Bengal Police SI 2024 Mock Test Series Quantitative Aptitude Time and Work Pipe and Cistern
An inlet pipe can fill an empty tank in 20 hours and an outlet pipe can empty the filled tank for 50 hours. If initially, both the pipes are opened then find the total time taken to fill the tank if the outlet pipe is closed when 75% of the tank is filled.
1
15
2
20
3
30
4
50