DD&DNH Recruitment · Quantitative Aptitude
Pipes, cisterns and combined work problems.
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Q1 · Time and Work · EASY
A cistern can be filled by pipe A in 12 hours and by pipe B in 15 hours. A drain pipe C can empty the full cistern in 20 hours. If all three pipes are opened together when the cistern is empty, how long will it take to fill the cistern completely?