RRB ALP · Pipes and Cisterns · Quiz
5 real RRB ALP questions on Pipes and Cisterns. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.
Question 1 of 5
MEDIUMTwo pipes A and B can fill a tank in 20 hours and 30 hours respectively. If both pipes are opened together, after how many hours should pipe B be closed so that the tank is filled in 12 hours?