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

Pipe A can fill a tank in 6.5 hours and pipe B can fill the tank in 13 hours. find the total time taken to fill the tank if pipe B opens every third hour while A opened for the whole time. 

1
5 hours
2
5.66 hours 
3
6 hours 
4
6.66 hours 
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