railway DFCCIL MTS 2025 Mock Test Series Quantitative Aptitude Time and Work Pipe and Cistern

A pipe can fill a cistern in 20 minutes whereas the cistern when full can be emptied by a leak in 28 minutes. When both are opened,the time taken to fill the cistern is:

1
48 min
2
70 min
3
80 min
4
60 min
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