railway DMRC CRA Mock Test Series Quantitative Aptitude Time and Work Pipe and Cistern

Pipe A fills a tank in 15 hours and pipe B in 20 hours. pipe C empties it in 60 hours. A servant by mistaken opens all the pipes. How much time will be taken to fill up the tank?

1

10 hours

2

12.5 hours

3

11 hours

4

11.5 hours

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