railway RRB Group D Mock Test Series 2024-25 Quantitative Aptitude Time and Work Pipe and Cistern

Two pipes can fill a cistern in 2 and 3 hours respectively. If both the pipes are opened together, then the time taken to fill the cistern is

1
3 hrs 30 minutes
2
4 hrs
3
60 minutes
4
1 hr 12 minutes
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